The present invention relates generally to a mobile radio telephone capable of recording and reproducing received frame data of voice channels, a data rate of which varies based on a voice traffic per unit time. The mobile radio telephone comprises a memory for storing and outputting data according to a control operation, a recording controller for sequentially storing format byte and data packets included in a voice channel frame inputted at a predetermined time period in response to a recording command in communication mode, a reproducing controller for analyzing a format byte of the voice channel frame sequentially stored in the memory and accessing data rate information and packet data in a frame unit, to thereby supply the accessed data to the decoder in response to the reproducing command in an idle mode and a digital-to-analog converter for converting a voice sample data outputted from the decoder into an analog signal.