Patent ID: 6377798
Filing Date: 2002-04-23
Classification: H04W,Y02D

Abstract:
A personal communications device operable in a paging mode and in a cellular telephone mode, comprising:a pager, said pager adapted in said paging mode to receive a paging message from a paging exchange indicating that a cellular telephone call is incoming, the paging message comprising an incoming call indicating message; a cellular telephone, said cellular telephone, when turned on, adapted in said cellular telephone mode to receive an incoming call indicating message indicating that a cellular telephone call is incoming; a battery operably coupled to provide power to said pager and said cellular telephone; and a power control circuit, in response to said cellular telephone to which said cellular telephone call is directed being turned off and thus exiting said cellular telephone mode and entering said paging mode, configured to connect said battery to said cellular telephone when an incoming paging message received by said pager indicates that said cellular telephone call is incoming, and when said power control circuit determines that sufficient charge remains in said battery over a predetermined period for said personal communications device to remain in at least a page receive mode over said predetermined period; wherein if sufficient charge remains, said cellular telephone call is switched from said pager and paging mode back to said cellular telephone and said cellular telephone mode.