A method is provided for tracking a mobile device in a wireless communications system. The method comprises establishing communications between the mobile device and a masquerading base station with the mobile device operating in a first mode, such as UMTS. The mobile device is urged to operate in a second mode such as GMS, and the mobile device is then tracked in the second mode of operation.

 
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< Synchronous/asynchronous interface circuit and electronic device

> Process for migrating a mobile station identity from a mobile identification number to an international mobile station identity
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