| 摘要 |
PURPOSE: A portable telephone having a power saving function by using a forced slip mode is provided to implement an alarm function that can be done in a telephone turned off in prior art, when a communication between the telephone and a base station is cut off and the telephone is in a slip mode. CONSTITUTION: When a portable telephone is turned on, devices mounted in the telephone are operated and initialized by a Mobile Station Modem(MSM)(300). Then, the telephone is in an idle state in which information about a base station is regularly and repeatedly obtained and stored. If a user selects a forced slip mode and, for example, a morning call function through a keypad(100), a timer for slip mode in the MSM(300) is started. When a time of the timer is reached to a time set by the call function, an alarm is issued by an audio(700).
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