A portable telephone includes a speech transmission circuit, data
transmission circuit, earphone/microphone detection circuit, and control
circuit. The speech transmission circuit performs speech communication
through an antenna. The data transmission circuit performs data
communication through the antenna simultaneously with speech communication
by the speech transmission circuit. The earphone/microphone detection
circuit detects an obstacle that causes a deterioration in transmission
efficiency of the antenna. When one of a data communication request during
speech communication and a speech communication request during data
communication is generated, the control circuit 11 determines on the basis
of a detection result obtained by the detection circuit whether to
permit/reject the request. A data communication control method for the
portable telephone is also disclosed.
