Patent ID: 8204475

Claim:
A method for protecting a mobile device from unauthorized use, comprising: determining that a removable provisioning data memory unit is new to the mobile device comprising: accessing the removable provisioning data memory unit installed in the mobile device to obtain an identifier; computing a first value from a combination of a mobile device identification number (MDIN) stored in a secure memory and the obtained identifier; and comparing the computed first value to one or more values previously stored in the secure memory of the mobile device; prompting a user to enter a MDIN in response to determining that the removable provisioning data memory unit is new to the mobile device; comparing an entered MDIN to the MDIN stored in the secure memory of the mobile device; storing the computed first value in the secure memory of the mobile device without replacing any of the one or more values previously stored in the secure memory of the mobile device if the entered MDIN matches the MDIN stored in the secure memory; and accessing the removable provisioning data memory unit only if the entered MDIN matches the MDIN stored in the secure memory.