| 摘要 |
A mobile communication system is comprised of a mobile phone device, a GSM network, and a W-CDMA network. A controller mounted in the mobile phone device updates GSM actually-used frequency data or W-CDMA actually-used frequency data both stored in a memory, in accordance with a DL frequency of a GSM cell or a W-CDMA cell detected by means of a GSM cell-searcher or a W-CDMA cell-searcher. The controller determines non-used frequencies not used in each of frequency bands, based on the actually-used frequency data, and causes the GSM cell-searcher or the W-CDMA cell-searcher to carry out cell-searching only with frequencies which may be used, except non-used frequencies.
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