An apparatus for communicating over a circuit switched network and a packetized data network. The apparatus includes a packetized data modem, a circuit switched modem, and a hybrid processor. The packetized data modem is configured to communicate with the packetized data network over a packetized data radio link via a radio. The circuit switched modem is configured to communicate with the circuit switched network over a circuit switched radio link via the radio. The hybrid processor is configured to monitor a circuit switched sleep cycle and a packetized data sleep cycle, and is configured to direct the packetized data modem and the circuit switched modem to switch between the networks according to the sleep cycles by prioritizing communications with the circuit switched network above communications with the packetized data network.