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    iphone 3g on o2 question

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    my freind has a 8gb iphone on 4.1 firmware locked to o2 but he took his sim out and put a new o2 one in and it didnt work said no sim. then he put his one back in and it worked? whats wrong that he cant put another one in

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    Could it be that the different sim isn't actually one of the newer breed of sims ie 3G. I had a similar problem when I took my years old o2 sim from my old phone and had the same result. I think to tell the difference would be that one has 3GP next to the SIM number
    Edited by: "simplyjimbo" 7th Oct 2010
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