A cellular telephone includes an internally integrated digital
entertainment module. The telephone includes a transceiver unit and a
headset which is connected to the transceiver unit by wired or wireless
link. The entertainment module includes an interchangeable ROM and/or
expansion RAM for storing music or other audio signals for playback
through the telephone's headset. Music or other audio signals in
digitized form is stored in the interchangeable ROM or is loaded into the
expansion RAM from a CD player, computer, or other source of digitized
audio signals. Under control of the cellular telephone's microprocessor,
the digitally stored audio signal is played back through the telephone's
headset. The entertainment module may be located in the transceiver unit,
a removable battery pack, or in a separate adapter.