| 摘要 |
The present invention relates to the one-time only call preventing device of a portable telephone set, and it particularly aims to provide a device preventing one-time only calls without answering to an unpleasant call by charging its originator for a one-time only call. For example, if a one-time only call arrives, a telephone directory database is retrieved. If the originating number of the one-time only call is not registered in the telephone directory database, or if the number is for a call set to a zero-calling time even though it is registered in the telephone directory database, the one-time only coping process of the present invention is performed. By adopting such a configuration, one-time only calls can be prevented and also answering to such unpleasant calls can be done without.
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