Abstract: A multi-mode telephone, e.g., an enhanced cell phone, includes a battery powered telephone module and a POTS telephone module. The phone includes a telephone jack for coupling the phone to a landline. When connected through the landline, the phone includes a mode of operation in which the phone can be operated without any external AC power source and without using internal battery power, the power used being supplied via the POTS landline. The multi-mode phone may function as a lifeline in times of emergency, e.g., during power failures when cell phone calls cannot be completed. Other modes of operation include an enhanced landline mode using the phone's battery power to provide enhanced features such as, e.g., caller ID. If battery power is depleted in the enhanced landline mode, the phone reverts to a standard POTS phone, e.g., during an in progress call, requiring no battery power for continued operation.