JP2004349868A - Mail or voice transmission/reception system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means capable of transmitting electronic mail, voice or the like by a mobile radio telephone set in a place incapable of receiving radio wave. <P>SOLUTION: When the mail is sent and received by a mobile radio telephone set 1 in a place that no radio wave reaches, the mobile radio telephone set 1 is connected to a public line 3 through a modem-incorporated adapter 2. In the modem-incorporated adapter 2, installation points of respective service centers 4 are previously registered and when a desired installation point is selected and specified among installation points displayed on the display panel of the mobile radio telephone set 1, the modem-incorporated adapter 2 dials the service center 4 at the specified installation point to connect the mobile radio telephone set 1 to the service center 4. After the service center 4 is connected to, mail can be received and a created document can be transmitted by operating the mobile radio telephone set 1 as usual. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a portable wireless telephone, and more particularly, to a portable wireless telephone having a function of transmitting and receiving information such as electronic mail.
[0002]
[Prior art]
2. Description of the Related Art In recent years, systems capable of transmitting and receiving e-mails with a single portable radio telephone have become widespread (see Patent Documents 1 and 2).
[0003]
Such a mail transmission / reception system usually has a portable radio telephone having a voice call function and an e-mail transmission / reception function, wirelessly communicates with the portable radio telephone, and transfers data between the relay server and the portable radio telephone. A wireless base station having a function, the relay server having a function of relaying data between the portable wireless telephone and a mail server in the Internet network, and storing an e-mail addressed to the portable wireless telephone; A mail server having a function of transmitting an e-mail transmitted from the telephone to a destination via the Internet network.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-77939 [Patent Document 2]
JP, 2002-44737, A
[Problems to be solved by the invention]
Mobile radio telephones are not always in a state in which wireless communication is always possible because their transmission and reception are affected by surrounding conditions, such as in buildings and underground shopping malls with poor radio wave propagation conditions, and whether or not they are within a wireless communication area. For example, there is a problem that an electronic mail cannot be transmitted.
[0006]
In addition, there is a problem that mail cannot be exchanged with the portable radio telephone during travel or business trip overseas (outside the country). In recent years, mobile phones with cameras are rapidly spreading, and it is expected that requests for sending e-mails with photos from destinations will increase. I can't respond. If you are overseas, you can send and receive emails with your laptop, but there is a problem that it becomes a baggage and you cannot use it anywhere.
[0007]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a means for enabling transmission of e-mail, voice, and the like by a portable wireless telephone in an environment where the portable wireless telephone cannot be used, such as a place where radio waves do not reach or overseas (outside Japan). To provide.
[0008]
[Means for Solving the Problems]
The mail transmission / reception system according to the present invention uses a public line in a place where radio waves of a portable radio telephone do not reach or where radio wave conditions are poor, so that a mail can be sent from a portable radio telephone or a mail addressed to itself can be received. Is made possible.
[0009]
Specifically, an e-mail transmission / reception system using the mobile radio telephone of the present invention includes a mobile radio telephone having a voice call function and an e-mail transmission / reception function, and is connected between the mobile radio telephone and a public line. A function of performing digital / analog conversion of mail data between a wireless telephone and a public line, and acquiring an ID (identification) from the portable wireless telephone, and automatically performing authentication with a service center that stores and transfers mail. An adapter with a built-in modem having a function, the service center having a function of storing mail arriving at the portable radio telephone, and transferring mail transmitted from the portable radio telephone to a destination, via the public line. Sending and receiving e-mails by the portable wireless telephone is performed.
[0010]
A user connects his / her portable wireless telephone to an adapter with a built-in modem for connecting to a public line, and the ISP (Internet service provider) that provides the adapter with a built-in modem via the public line by the adapter with a built-in modem. ) Connect to the service center. The service center stores the mail sent to the mail addresses of the registered users, and transmits the mail sent from the portable wireless telephone via the public line to the mail address of the other party.
[0011]
According to the present invention, an adapter with a built-in modem, which is a means for connecting a portable wireless telephone to a wired telephone, and a service center for storing mail transmitted to a user and transmitting received mail are connected to a public line or an IP network. Since the connection is made via the Internet, it is possible to construct a system that enables transmission and reception of mail even in places where radio waves do not reach.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing a first embodiment of the present invention.
[0013]
In FIG. 1, a mobile wireless telephone 1 has a voice communication function and a mail transmission / reception function, and has key buttons for reading and writing mail, cursor buttons, a display panel for displaying a document, and the like. It also has an interface for connecting to the modem built-in adapter 2.
[0014]
The adapter 2 with a built-in modem is a device for connecting the mobile radio telephone 1 and a service center 4 of an ISP that provides the adapter 2 with a built-in modem via a public line 3 and has a digital / analog conversion function of mail data. In addition, it has a protocol function for automatically acquiring the ID of the mobile radio telephone 1 when connecting to the mobile radio telephone 1 and automatically performing user authentication when connecting to the service center 4. With a physical interface between them.
[0015]
The service centers 4 are installed, for example, in various parts of the country by ISPs that provide the mail transmission / reception service of the present embodiment, and are connected to each service center by an IP (Internet) network or a dedicated network. In addition, the telephone number of an access point for connecting to the service center 4 is recorded in the adapter 2 with a built-in modem together with each installation point.
[0016]
The service center 4 has a function of storing e-mails addressed to the user and transmitting e-mails transmitted from the user to a destination. It has a function of performing authentication work with the built-in adapter 2.
[0017]
Next, the operation of the present embodiment will be described with reference to FIG.
[0018]
When the user wants to send and receive mail with the portable wireless telephone 1 in a place where radio waves do not reach or where the radio wave condition is poor, the portable wireless telephone 1 is connected to the public line via the modem built-in adapter 2 carried together with the portable wireless telephone 1. Connect to 3. The installation point of each service center 4 is registered in advance in the adapter 2 with a built-in modem, and when the adapter 2 with a built-in modem is connected to the mobile wireless telephone 1, the installation point of each service center 4 is displayed on the display panel of the mobile wireless telephone 1. Is displayed.
[0019]
When the user selects and designates a desired installation point from the installation points displayed on the display panel of the mobile wireless telephone 1, the adapter 2 with a built-in modem dials the service center 4 at the specified installation point. The processing for connecting the mobile radio telephone 1 and the service center 4 is started.
[0020]
For example, if “Fukuoka, Osaka, Nagoya, Tokyo, Sendai, Sapporo” is displayed on the display panel of the mobile radio telephone 1 as the installation location of the service center 4, if “Tokyo” is specified, the modem built-in adapter 2 performs processing for connecting to the service center 4 installed in Tokyo. At this time, if the user selects the installation point closest to his / her current location from among the installation points of the service center 4 displayed on the display panel of the portable radio telephone 1, the user is connected to the nearest service center 4. Therefore, communication costs for using the public line can be minimized.
[0021]
When the adapter with a built-in modem 2 is connected to the mobile phone 1, the ID of the mobile phone 1 is automatically read into the adapter 2 with the built-in modem and used for authentication when connecting to the service center 4. After connecting to the service center 4, it becomes possible to receive a mail or transmit a created document by a normal operation of the mobile wireless telephone 1.
[0022]
According to the present embodiment, even in a place where the radio wave of the mobile radio telephone does not reach or where the radio wave condition is poor, if the mobile phone can be connected to the public line, it is possible to transmit and receive mails with this mobile radio telephone. Thus, the range of use of the portable radio telephone can be expanded.
[0023]
FIG. 2 is a block diagram showing a second embodiment of the present invention. In the present embodiment, an ISP having a service center in Japan is affiliated with an ISP having a roaming service center connected to an overseas (overseas) public line, thereby using an international roaming service overseas and using a domestic roaming service. The service center is configured to be accessible.
[0024]
In FIG. 2, the telephone number of the access point for connecting to the roaming service center 5 of the overseas ISP affiliated with the ISP that provides the modem built-in adapter 2 is provided at the installation point ( Location name). The connection to the access point is made in the same way as the connection to the service center in Japan.
[0025]
That is, when the user wants to send and receive mail with the mobile wireless telephone 1 overseas, the user connects the adapter 2 with a built-in modem between the mobile wireless telephone 1 and the overseas public line 3. When the user selects an installation point (location name) displayed on the display panel of the mobile wireless telephone 1 from the adapter 2 with a built-in modem, the access point (roaming service center 5) of the affiliated ISP installed at that location is selected. Connected.
[0026]
The roaming service center 5 is connected to the service center 4 installed by the affiliated domestic ISP via the Internet 6, so that the portable radio telephone 1 is connected to the overseas public line 3 and the domestic roaming service center 5 via the roaming service center 5. Is connected to the service center 4 of
[0027]
Therefore, the user can connect to the roaming service center 5 of the affiliated ISP in each city by using the adapter 2 with a built-in modem abroad, and store it at the domestic service center with only a low-cost local connection fee and roaming service fee. It is possible to obtain and send the e-mail.
[0028]
FIG. 3 is a block diagram showing a third embodiment of the present invention. In the present embodiment, voice compression is performed using the voice compression function of the portable wireless telephone 1, and connection to the domestic public line is made via the Internet and a service center having a VoIP gateway function via a public line. It is configured to have an IP telephone function.
[0029]
In FIG. 3, the telephone number of the access point for connecting to the roaming service center 5 of the overseas ISP affiliated with the ISP that provides the modem internal adapter 2 is provided at the installation point ( Location name). The connection to the access point is made in the same way as the connection to the service center in Japan.
[0030]
When making an Internet call with the mobile wireless telephone 1 overseas, the user connects the modem built-in adapter 2 between the mobile wireless telephone 1 and the overseas public line 3. When the user selects an installation point (location name) displayed on the display panel of the mobile wireless telephone 1 from the adapter 2 with a built-in modem, the access point (roaming service center 5) of the affiliated ISP installed at that location is selected. Connected.
[0031]
The roaming service center 5 transmits voice as data on the Internet 6 (or its own network), connects to the domestic service center 4 as a partner, and transmits the data. The service center 4 has a VoIP (Voice over Internet Protocol) gateway function, and transfers data to the public line 3 in the corresponding country. Thus, if the user takes the portable wireless telephone 1 and the adapter 2 with a built-in modem, an inexpensive international call can be used with only the local call charge and the roaming service charge.
[0032]
FIG. 4 is a block diagram showing a fourth embodiment of the present invention. The present embodiment has a configuration in which the IP telephone function can be used in Japan.
[0033]
In FIG. 4, the telephone number of the access point for connecting to the service center 4 of the ISP that provides this modem 2 is recorded in the adapter 2 with the installation location (location name). The connection to the access point is made in the same manner as in FIG.
[0034]
When a user makes an Internet call using the portable wireless telephone 1 via the public line 3, voice data is transmitted to the service center 4 via the modem built-in adapter 2 and the public line 3. The service center 4 places the received voice data on the IP telephone network 7 owned by the ISP, transmits the voice data to the service center 4 installed on the called side, and transmits the data again to the public line 3 of the called side. And change.
[0035]
Also in this embodiment, by selecting the service center 4 closest to the access point registered in the adapter 2 with a built-in modem as a connection destination, it is possible to make a call at low cost.
[0036]
FIG. 5 is a block diagram showing a fifth embodiment of the present invention. The present embodiment has a configuration in which an adapter with a built-in modem has a wireless LAN function.
[0037]
In FIG. 5, an adapter with a built-in modem connected to the portable wireless telephone 1 is configured as an adapter 2 with a built-in wireless function that also has a wireless LAN function. On the other hand, to a local network (IP network) 9 provided by the roaming service center 5, a wireless LAN base station 8 that performs transmission and reception with the wireless function built-in adapter 2 by wireless LAN is connected.
[0038]
In the present embodiment, the adapter with a built-in modem connected to the mobile wireless telephone 1 is configured as the adapter with a built-in wireless function 2 and transmitted to the IPS roaming service center 5 via the wireless LAN base station 8 so that the mobile telephone 1 and the service center 4 are connected. The connection operation between the mobile wireless telephone 1 and the roaming service center except for the point of transmission and reception by the wireless LAN is the same as in the first to fourth embodiments.
[0039]
According to the present embodiment, if the user goes to an environment where a wireless LAN can be used without searching for a connection point between the portable wireless telephone and the public line, the user is automatically connected to the Internet, and can transmit and receive mails and perform IP telephone calls.
[0040]
FIG. 6 is a block diagram showing a sixth embodiment of the present invention. In this embodiment, the adapter 2 with a built-in GPS function is configured as the adapter 2 with a built-in GPS function in the adapter 2 with a built-in wireless function in the fifth embodiment.
[0041]
In the present embodiment, when the wireless function + GPS function built-in adapter 2 is connected to the mobile phone 1, the wireless function + GPS function built-in adapter 2 detects the position by the GPS function, and the access point registered in the adapter 2 (Roaming service center) 5 automatically selects the nearest access point and executes the connection processing.
[0042]
According to the present embodiment, even if the user does not select an access point, the nearest access point of the portable wireless telephone to which the adapter 2 is connected is automatically selected by the GPS function built into the adapter, so that the user can Just by connecting the mobile wireless telephone 1 and the wireless function + GPS function built-in adapter 2 near the wireless LAN base station 8, mail transmission / reception and IP telephone can be performed.
[0043]
It should be noted that the GPS function can be built in the adapter with a built-in modem 2 in the first to fourth embodiments. In this case, if the portable radio telephone 1 is connected to a public line via the adapter 2 with a built-in modem with a GPS function, the same operation and effect as in the sixth embodiment can be obtained.
[0044]
【The invention's effect】
The present invention relates to a modem for connecting a mobile radio telephone to a public line and performing digital / analog conversion of mail data, an adapter with a built-in modem having a function of acquiring an ID from the mobile radio telephone and automatically performing authentication with a service center, and storage of mail. In addition, a service center for forwarding is provided, so that it is possible to send and receive e-mails using wired telephone equipment even in places where radio waves of mobile radio telephones do not reach or where radio wave conditions are poor. Become.
[0045]
Overseas (overseas), it is also possible to send and receive e-mails or make international calls using a portable wireless phone just by using a dedicated adapter with a built-in modem. There is also an advantage that it does not take up space and does not become luggage.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of the present invention.
FIG. 2 is a block diagram showing a second embodiment of the present invention.
FIG. 3 is a block diagram showing a third embodiment of the present invention.
FIG. 4 is a block diagram showing a fourth embodiment of the present invention.
FIG. 5 is a block diagram showing a fifth embodiment of the present invention.
FIG. 6 is a block diagram showing a sixth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mobile radiotelephone 2 Adapter with built-in modem 3 Public line 4 Service center 5 Roaming service center 6 Internet 7 IP telephone network 8 Wireless LAN base station 9 IP network

Claims (24)

A portable wireless telephone having a voice call function and an e-mail transmission / reception function,
A function for performing digital / analog conversion of mail data between the portable radio telephone and the public line, and an ID for acquiring the ID from the portable radio telephone and storing / transferring the mail. An adapter with a built-in modem that has a function of performing automatic authentication with a service center that performs
The service center having a function of storing mail delivered to the portable wireless telephone, and forwarding the mail transmitted from the portable wireless telephone to a destination,
An e-mail transmission / reception system, wherein transmission / reception of e-mail by the portable wireless telephone via the public line is enabled. The installation point of the service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and a public line, the service registered in the adapter with a built-in modem is registered. The installation point of the center is displayed on the display panel of the portable radio telephone, and when the installation point displayed on the display panel is designated by the user, the service center of the designated installation point and the portable radio telephone are 3. The mail transmission / reception system according to claim 2, wherein is connected via a public line. The adapter with a built-in modem has a built-in GPS function, and the installation point of the service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and a public line. The connection point is detected by the GPS function, the service center located at the installation point closest to the detected connection point is automatically selected, and the selected service center and the portable radio telephone are connected to a public line. The e-mail transmission / reception system according to claim 2, wherein the e-mail transmission / reception system is connected via a mail. A modem built-in adapter used for the mail transmission / reception system according to claim 1,
A function for performing digital / analog conversion of mail data between the portable radio telephone and the public line, and an ID for acquiring the ID from the portable radio telephone and storing / transferring the mail. An adapter with a built-in modem, having a function of performing automatic authentication with the service center that performs the authentication. A portable wireless telephone having a voice call function and an e-mail transmission / reception function,
A function for performing digital / analog conversion of mail data between the portable radio telephone and the public line, and an ID connected from the portable radio telephone to the foreign public line; An adapter with a built-in modem that has a function to perform automatic authentication with a service center that stores and forwards mail via a roaming service center of
A service center that is connected to the roaming service center via the Internet, has a function of storing mail delivered to the mobile wireless telephone, and having a function of transferring the mail transmitted from the mobile wireless telephone to a destination;
An e-mail transmission / reception system, wherein e-mail transmission / reception can be performed between the portable wireless telephone and the service center via the public line. The installation point of the roaming service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and the public line outside the country, the adapter is registered with the adapter with a built-in modem. The installation location of the roaming service center is displayed on a display panel of the portable wireless telephone, and when the installation location displayed on the display panel is designated by a user, the roaming service center at the designated installation location is designated. 6. The mail transmission / reception system according to claim 5, wherein the mobile radio telephone is connected to the portable radio telephone via the public line. The adapter with a built-in modem has a built-in GPS function, and the installation point of the roaming service center is registered in advance in the adapter with a built-in modem, and the adapter with a built-in modem is connected between the portable wireless telephone and the public line. The connection point is detected by the GPS function, the roaming service center located at the installation point closest to the detected connection point is automatically selected, and the selected roaming service center and the portable radio telephone are connected. 6. The mail transmission / reception system according to claim 5, wherein the e-mail and the e-mail are connected via the public line. An adapter with a built-in modem for use in the mail transmission / reception system according to any one of claims 5 to 7,
A function for performing digital / analog conversion of mail data between the portable wireless telephone and the public line, which is connected between the portable wireless telephone and the public line, and acquiring an ID from the portable wireless telephone and storing the mail An adapter with a built-in modem, which has a function of performing automatic authentication with the service center that performs the transfer. A portable wireless telephone having a voice call function;
A function for performing digital / analog conversion of audio data between the mobile wireless telephone and the public line, and an ID for acquiring the ID from the mobile wireless telephone and transferring the audio data; A built-in modem having a function of performing automatic authentication with a first service center that performs
The first service center having a function of transferring voice data from the portable wireless telephone to a second service center on the receiving side connected to a public line via a dedicated IP telephone network;
An audio transmission / reception system, wherein transmission / reception of audio by the portable wireless telephone is enabled via the public line. The installation point of the service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and a public line, the service registered in the adapter with a built-in modem is registered. The installation point of the center is displayed on the display panel of the portable radio telephone, and when the installation point displayed on the display panel is designated by the user, the service center of the designated installation point and the portable radio telephone are 10. The voice transmitting / receiving system according to claim 9, wherein is connected via a public line. The adapter with a built-in modem has a built-in GPS function, and the installation point of the service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and a public line. The connection point is detected by the GPS function, the service center located at the installation point closest to the detected connection point is automatically selected, and the selected service center and the portable radio telephone are connected to a public line. The voice transmission / reception system according to claim 9, wherein the voice transmission / reception system is connected via a wireless LAN. A built-in modem adapter for use in the voice transmission / reception system according to claim 9,
A function for performing digital / analog conversion of audio data between the mobile radio telephone and the public line, and an ID connected to the mobile radio telephone and the public line; An adapter with a built-in modem, which has a function of performing automatic authentication with a service center that performs transfer of data. A portable wireless telephone having a voice call function;
A function for performing digital / analog conversion of voice data between the portable radio telephone and the public line, and an ID for acquiring the ID from the portable radio telephone; A built-in modem having a function of performing automatic authentication between a roaming service center and a service center having a VoIP gateway function of transferring the voice data via the Internet,
A service center having the VoIP gateway function of transferring voice data from the portable wireless telephone to a domestic public line via the Internet,
A voice transmission / reception system, wherein voice transmission / reception by the portable wireless telephone is enabled via the foreign public line and the domestic public line. The installation point of the roaming service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and the public line outside the country, the adapter is registered with the adapter with a built-in modem. The installation location of the roaming service center is displayed on a display panel of the portable wireless telephone, and when the installation location displayed on the display panel is designated by a user, the roaming service center at the designated installation location is designated. 14. The voice transmitting / receiving system according to claim 13, wherein the portable radio telephone is connected to the portable radio telephone via the public line. The adapter with a built-in modem has a built-in GPS function, and the installation point of the roaming service center is registered in advance in the adapter with a built-in modem, and the adapter with a built-in modem is connected between the portable wireless telephone and the public line. The connection point is detected by the GPS function, the roaming service center located at the installation point closest to the detected connection point is automatically selected, and the selected roaming service center and the portable radio telephone are connected. 14. The voice transmitting / receiving system according to claim 13, wherein the voice communication is connected via the public line. An adapter with a built-in modem for use in the voice transmission / reception system according to claim 13,
A function for performing digital / analog conversion of voice data between the portable wireless telephone and the foreign public line, and an ID for acquiring an ID from the portable wireless telephone; And a function for automatically performing authentication with a service center having the VoIP gateway function. A portable wireless telephone having a voice call function and an e-mail transmission / reception function,
A function that is connected between the portable wireless telephone and an IP network provided by an ISP via a wireless LAN base station and performs digital / analog conversion of mail data between the portable wireless telephone and the IP network; An adapter with a built-in modem with a wireless LAN function having a function of acquiring an ID from a telephone and automatically performing authentication with a service center of the ISP that stores and transfers mail;
The service center having a function of storing mail delivered to the portable wireless telephone, and forwarding the mail transmitted from the portable wireless telephone to a destination,
An e-mail transmission / reception system, wherein transmission / reception of e-mails by the portable wireless telephone via the IP network is enabled. The installation point of the service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and the IP network by wireless LAN, the adapter is registered in the adapter with a built-in modem. The installation location of the service center is displayed on a display panel of the mobile wireless phone, and when the installation location displayed on the display panel is designated by a user, the service center of the designated installation location and the 18. The mail transmission / reception system according to claim 17, wherein the mobile radio telephone is connected via the IP network. The adapter with a built-in modem has a built-in GPS function, and the installation point of the service center is registered in advance in the adapter with a built-in modem, and the adapter with a built-in modem is connected to the wireless LAN between the portable radio telephone and the IP network. The connection point is detected by the GPS function, the service center at the installation point closest to the detected connection point is automatically selected, and the selected service center and the portable wireless telephone are connected to each other. 18. The mail transmission / reception system according to claim 17, wherein is connected via the IP network. An adapter with a built-in modem for use in the mail transmission / reception system according to any one of claims 17 to 19,
A function of connecting the portable radio telephone and the IP network by a wireless LAN, a function of performing digital / analog conversion of mail data between the portable radio telephone and the IP network, and obtaining an ID from the portable radio telephone A built-in modem with a wireless LAN function, which has a function of automatically performing authentication with the service center that stores and forwards mail. A portable wireless telephone having a voice call function and an e-mail transmission / reception function,
A function that is connected between the portable wireless telephone and an IP network provided by an ISP via a wireless LAN base station and performs digital / analog conversion of mail data between the portable wireless telephone and the IP network; An adapter with a built-in modem with a wireless LAN function having a function of acquiring an ID from a telephone and automatically performing authentication with a service center for storing and transferring mail via a roaming service center of the ISP providing the IP network; ,
A service center that is connected to the roaming service center via the Internet, has a function of storing mail delivered to the mobile wireless telephone, and having a function of transferring the mail transmitted from the mobile wireless telephone to a destination;
A mail transmission / reception system wherein transmission / reception of mail between the portable wireless telephone and the service center is enabled via the IP network and the Internet. The installation location of the roaming service center is registered in advance in the adapter with a built-in modem, and when the adapter with a built-in modem is connected between the portable wireless telephone and the IP network by wireless LAN, the registration is made in the adapter with a built-in modem. The installation location of the roaming service center is displayed on a display panel of the mobile wireless telephone, and when the installation location displayed on the display panel is designated by a user, the roaming service of the designated installation location is provided. 22. The mail transmission / reception system according to claim 21, wherein a center and the portable wireless telephone are connected via the IP network. The adapter with a built-in modem has a built-in GPS function, and the installation point of the roaming service center is registered in advance in the adapter with a built-in modem. When connected to the, the connection point is detected by the GPS function, the roaming service center at the installation point closest to the detected connection point is automatically selected, the selected roaming service center and the 22. The mail transmission / reception system according to claim 21, wherein a mobile radio telephone is connected via the IP network. A built-in modem adapter used in the mail transmission / reception system according to any one of claims 21 to 23,
A function of connecting the portable radio telephone and the IP network by a wireless LAN, a function of performing digital / analog conversion of mail data between the portable radio telephone and the IP network, and obtaining an ID from the portable radio telephone A built-in modem with a wireless LAN function, which has a function of automatically performing authentication with the service center that stores and forwards mail.

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