Mobile communication system and mobile terminal

A mobile terminal comprising:

• (a) a transceiver unit which has a function of receiving and transmitting text communication data in packet and a function of receiving and transmitting an email in packet, and which has an e-mail address associated with a telephone number of said transceiver;
• (b) an interface through which text communication data and an e-mail can be made by a user;
• (c) a display unit for displaying said text communication data and e-mail;
• (d) a first controller which is activated when said mobile terminal is called or when said mobile terminal makes a response to start text communication, and which transmits text communication data through said transceiver unit and displays text communication data received through said transceiver unit, on said display unit;
• (e) a second controller which transmits an e-mail input through said interface, and displays an e-mail received through said transceiver unit, on said display unit;
• and
• (f) a third controller which keeps said first controller to operate to continue transmission of text communication data, when an allowance for starting text 15 communication is received from an opponent, and which inactivates said first controller and activates said second controller to thereby transmit an e-mail, when a rejection against starting text communication is received from an opponent.

A method of making communication between a mobile terminal and an opponent through network, comprising the steps of:

• (a) said mobile terminal transmitting text communication data to said opponent through said network;
• (b) said opponent making a response indicating of rejection to make text communication with said mobile terminal;
• and
• (c) said mobile terminal inactivating a function of data communication and activating a function of e-mail communication, to thereby transmit an e-mail to said opponent in place of said text communication data.

A method of making communication between a mobile terminal and an opponent through network, comprising the steps of:

• (a) said mobile terminal transmitting text communication data to said opponent through said network;
• (b) judging whether said opponent is within a service area or not, and whether said opponent is turned on or not;
• and
• (c) said mobile terminal inactivating a function of data communication and activating a function of e-mail communication, to thereby transmit an e-mail to said opponent in place of said text communication data, if said opponent is judged out of a service area or judged to be turned off.

A method of making communication between a mobile terminal and an opponent through network, comprising the steps of:

• (a) a user selecting text communication or e-mail communication;
• (b) storing text communication data in a memory, if said user selects text communication;
• (c) establishing a packet communication channel between said mobile terminal and said opponent;
• (d) judging whether said opponent allows to receive said text communication data from said mobile terminal;
• and
• (e) transmitting said text communication data stored in said memory, to said opponent, if said opponent allows to receive said text communication data from said mobile terminal, and transmitting an e-mail to said opponent in place of said text communication data without disconnecting said packet communication channel, if said opponent does not allow to receive said text communication data from said mobile terminal.

A method of making communication between a mobile terminal and an opponent through network, comprising the steps of:

• (a) a user selecting text communication or e-mail communication;
• (b) storing text communication data in a memory, if said user selects text communication;
• (c) establishing a packet communication channel between said mobile terminal and said opponent;
• (d) judging whether said opponent is within a service area or not, and whether said opponent is turned on or not;
• and
• (e) said mobile terminal inactivating a function of data communication and activating a function of e-mail communication, to thereby transmit an e-mail to said opponent in place of said text communication data without disconnecting said packet communication channel, if said opponent is judged out of a service area or judged to be turned off.