| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable telephone prepayment system which is low-cost, since no prepaid card system is used and can prevent theft by another person. SOLUTION: Exchange of a telephone office, etc., allows a telephone call, corresponding to the amount of money corresponding to the prepayment number of the portable telephone set having an ID number, when the decoded number, obtained by descrambling the coded number obtained by the prepayment number with the ID number of the portable telephone number with the ID number of the portable telephone set sent from a sender, is matched, with the prepayment number.
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