Mobile communication device

A cellular telephone and base unit system comprising:

• a secondary cellular telephone capable of connecting with a cellular network, sharing a common telephone number with a primary cellular telephone, wherein the primary cellular telephone and the secondary cellular telephone are subscribed with the cellular network,
• and wherein the secondary cellular telephone includes a power mode configuration of at least an active mode and a charging mode, wherein the secondary cellular telephone can communicate with the cellular network when set to the active mode and the secondary cellular telephone can cease to communicate with the cellular network when set to the charging mode;
• a base unit, wherein the base unit is at least one of a base unit of the cellular telephone and a charging cable, capable of charging a battery of the secondary cellular telephone, wherein the base unit provides a mechanism to couple with the secondary cellular telephone and the secondary cellular telephone includes a sensor configured to detect the coupling and decoupling of the secondary cellular telephone with the base unit;
• wherein the secondary cellular telephone automatically sets to the charging mode when coupled to the base unit and the secondary cellular telephone automatically sets to the active mode when decoupled with the base unit.

A cellular telephone comprising:

• a radio transceiver;
• a battery;
• and
• a battery monitoring system coupled to the battery and coupled to the radio transceiver, wherein the battery monitoring system, upon determining a prescribed state of the power capacity of the battery, causes the radio transceiver to automatically send a notification about the state of the battery to a designated destination through a cellular network.