Patent ID: 6999761

Claim:
A system for providing telephone service to a POTS device interfaced to a wireless device that communicates through a wireless telephone network, comprising: an emitter separate from the wireless device that produces a first signal; a receiver at the wireless device that is configured to receive the first signal when in proximity to the emitter and provide an indication of receiving the first signal to indicate that the wireless device is in proximity to the emitter; a converter at the wireless device for interfacing at least the transmission and reception portion of the wireless device to a POTS connection such that the at least transmission and reception portion provides telephone service via the wireless telephone network to the POTS connection, wherein the converter is configured to receive the indication from the receiver as to whether the first signal has been received and to terminate a call in progress if the first signal has not been received; and a memory at the wireless device that stores a unique ID for the emitter, wherein the first signal has an encoded ID that identifies the emitter, and wherein the converter is further configured to provide wireless telephone service to the POTS connection only when the encoded ID from the first signal matches the unique ID stored in the memory.