Patent ID: 6985744

Claim:
A method for operating a cellular phone for making a call comprising: receiving in the cellular phone information related to a local time of a receiving end from a cellular phone that is at the receiving end or from a base station configured to register the cellular phone that is at the receiving end; acquiring in the cellular phone local time of the receiving end based on the received information; deciding in the cellular phone whether a time zone of the receiving end matches a time zone of the transmitting end based on the acquired local time; informing a user via the cellular phone of the acquired local time or the time zone of the receiving end if the receiving end and the transmitting end are in different time zones; displaying the acquired local time on a display of the cellular phone displaying a plurality of communication modes on the display if the receiving end and the transmitting end are in different time zones, the plurality of communication modes include a mail mode and/or a message mode; and performing call processing in the cellular phone if the receiving end and the transmitting end are in the same time zone.