Adjusting time differences for internationally roaming cellular phone

摘要

The time zone of a mobile phone is automatically adjusted during world wide travel. When the cpu of the cellular phone determines that the base station is other than its home station, it accesses a data base and looks up a conversion table for the time zone corresponding to the connected base station, and shows this time as a local time on the mobile phone display. The mobile may be further commanded to go into standby mode, and may include a keypad for alphanumeric input, and may be a PDA.