Pre-paid cellular telephone system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 8, 2000
Grant Date -
N/A
app pub date -
Aug 15, 1996
filing date -
Aug 15, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cellular telephone system maintains a database of prepaid cellular telephone service accounts, including an amount of money remaining in each account. The system uses modems in a blank-and-burst mode to send data and commands over a voice channel. When a call is attempted over a mobile unit, the system sends identification information stored in the mobile unit to a debit processing unit, which then permits the call and debits the associated account if a sufficient amount of money remains in the account, otherwise it terminates the call.
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Family
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