Help how do I activate a 2g iPhone

    Help just upgraded an old 2g iPhone I've had since new, however it will not activate through iTunes claiming the sim is invalid, it an o2 contract sim and has been used in the phone for a year or is not the original sim however, any help appreciated firmware 3.1.3.


    1. is the phone locked to another network?
    2. turn on and off the phone.
    3. if that fails, call the free O2 customer line 202? i called them to activate/register after itunes update.…one

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