Patent ID: 7248892

Claim:
A portable communications device comprising a main body having a removable housing portion; the main body having: a transceiver operable to enable transmission and reception of communications over a mobile telecommunications network; a first controller operable to control operation of the device; and a radio frequency signal supplier operable to supply a radio frequency carrier signal; and a first inductive coupler operable to couple the radio frequency carrier signal inductively to a second inductive coupler of the removable housing portion when the removable housing portion is connected to the main body, the removable housing portion having: a memory; a power supply deriver operable to derive a power supply from the radio frequency signal supplied by the portable communications device when the first and second inductive couplers are inductively coupled; a second controller operable to read data from the memory in response to derivation of a power supply by the power supply deriver; a radio frequency signal modulator operable to modulate a radio frequency carrier signal supplied by the radio frequency signal supplier of the main body and inductively coupled to the second inductive coupler in accordance with the data read from the memory; and the main body having: a detector operable to detect the effect of the radio frequency signal modulator on the radio frequency carrier signal to affect the operation of the portable communications device.