| 摘要 |
In a mobile communication terminal device, a serial number for use in charging control of a subscriber and so on is prevented from being incorrectly rewritten and hence the subscriber is prevented from being incorrectly charged. An electrically writable/erasable memory 10 in the mobile communication terminal device includes a first storage region RG1 for storing information as an encoded serial number and a storage region RG2 for storing said serial number before encoding, and further a CPU 2 includes means for decoding said encoded information and comparing it with said serial number, and disabling the mobile communication terminal upon incoincidence being noted. <IMAGE> |
