Power MOSFET devices provide highly linear transfer characteristics and can be used effectively in linear power amplifiers. The customer interface system has a check reader and a card issuing machine. The device also utilizes modular peripherals to extend battery life and increase the effectiveness of the overall system. Upon authenticating the subscriber and the remote device, the login server, accesses the subscriber information on the data center messaging server and provides the subscriber information to the remote access device in response to the received request. The contact sequence is based at least in part on the received preference data.