| 摘要 |
The invention relates to a mobile system and especially to detecting, in the mobile system in question, the use of terminal equipment having a copied mobile equipment identity. In the invention, a database (2A-4, 2B-1) containing records (T1 to T4, T5 to T8) is created, each record containing an international mobile equipment identity (IMEI) associated with a mobile station and an international mobile subscriber identity (IMSI), a check (3-26, 3-32) is made to see whether the database (2A-4, 2B-1) contains a record which contains a mobile equipment identity corresponding to the mobile equipment identity transmitted by the mobile station, but whose mobile subscriber identity does not correspond to that transmitted by the mobile station, and if yes, at least a signal (3-38) is produced, indicating that the mobile equipment identity is possibly a copied one.
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