Method for automatically adjusting time difference of cellular phone international roaming
First Claim
1. In a cellular phone having a memory with an embedded data base for storing a time conversion table regarding information about time of one of a plurality of places in the world belonging to a first telephone system and a corresponding time of the other place in the world belonging to a second telephone system different from said first telephone system, a method for automatically adjusting a time difference between said cellular phone and a connected base station during an international roaming comprising the steps of:
- (a) when a central processing unit (CPU) of said cellular phone determines that an associated telephone system is different from that of said connected base station, said telephone system associated with said cellular phone accessing said data base and looking up said conversion table for retrieving a corresponding time of said connected base station with respect to said cellular phone; and
(b) showing said corresponding time as a local time on a display of said cellular phone.
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Accused Products
Abstract
In a cellular phone having a memory with a data base for storing a time conversion table regarding time of one place in the world belonging to a first telephone system and corresponding time of the other place in the world belonging to a second telephone system different from the first one, a method for automatically adjusting a time difference between the cellular phone and a connected base station during an international roaming comprises the steps of when a CPU of the cellular phone determines that an associated telephone system is different from that of the connected base station, the telephone system accessing the data base and looking up the conversion table for retrieving a corresponding time of the connected base station with respect to the cellular phone; and showing the corresponding time as a local time on a display of the cellular phone.
11 Citations
6 Claims
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1. In a cellular phone having a memory with an embedded data base for storing a time conversion table regarding information about time of one of a plurality of places in the world belonging to a first telephone system and a corresponding time of the other place in the world belonging to a second telephone system different from said first telephone system, a method for automatically adjusting a time difference between said cellular phone and a connected base station during an international roaming comprising the steps of:
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(a) when a central processing unit (CPU) of said cellular phone determines that an associated telephone system is different from that of said connected base station, said telephone system associated with said cellular phone accessing said data base and looking up said conversion table for retrieving a corresponding time of said connected base station with respect to said cellular phone; and
(b) showing said corresponding time as a local time on a display of said cellular phone. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification