This is an indispensable tool for cellular industry staff including technicians and security managers, as well as cellular shops and dealers. Now generating a valid A-Key with 6-digit checksum can be done on the spot, provided you know the phone's ESN number.
This is sometimes required for testing the phone's A-Key entry function as well as for the phone's activation. It used to be possible to obtain a valid A-Key with cheksum only from the cellular operator itself, now everyone can easily generate the secret checksum value, enter those magic numbers into the phone just using the phone's own keypad and see how the phone is accepting the new A-Key by displaying "VALID".
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