Patent ID: 6442406
Filing Date: 2002-08-27
Classification: H04M,H04W

Abstract:
A portable telephone comprising:a user interface; a processor, operating a program that controls operation of the portable telephone; cellular electronics, enabling placing and receiving telephone calls based on operations on said user interface; and a memory storing a program for operation by said processor and also storing an airtime limit value which limits an amount of operation of said portable telephone, wherein said memory also stores a parameter which includes an identifier of a plurality of telephone numbers that are exempt from said airtime limit value, and wherein said memory also stores a value indicative of a reset interval, after which said airtime limit value is automatically reset, said phone being allowed to originate or receive calls as long as said airtime limit value is not exceeded, but not after said airtime limit value is exceeded, and only until said reset internal has elapsed, unless the phone number of said originated call, or the phone number of said received call, is identified by said parameter which includes an identifier of a plurality of telephone numbers that are exempt from said airtime usage limit.