A mobile communication terminal wirelessly coupled to at least one mobile communication network comprising a memory for storing user payment information; a first modem for communicating over a first mobile communication network to provide the user payment information to the memory; a second modem for a communicating over a second mobile communication network to read the user payment information from the memory, when performing an electronic transaction over the second mobile communication network; and a transmitter for transmitting the user payment information in a wireless data format, wherein power applied to the first modem is changed from a first state to a second state after providing the user payment information to the memory.