WIRELESS TERMINAL DEVICE, SWITCHING CONTROL PROGRAM, AND SWITCHING CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To avoid the situation when SMS transmission/reception becomes unavailable.SOLUTION: A multi wireless terminal 8 is capable of communication by a circuit switched system CDMA2000 1x and packet communication systems CDMA2000 1xEV-DO and LTE. Detection units 54B and 54C detect whether or not communication is available by CDMA2000 1xEV-DO and LTE. On the basis of the detection result, a notification unit 69 notifies an SMS switching control server on the network whether to use the circuit switched system or the packet communication systems for SMS communication.