New to iphone and a bit confused ??

tanzi7

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Apr 15, 2009
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Hi, I am just about to buy an iphone 3g but have one question, I have a contract with o2, I took it out as it was a cheap monthly payment and got a nokia 5800, if I buy an iphone on pay as you go can I use my contract sim in it or does it have to be jailbroken and unlocked or just jailbroken, sorry if it's a stupid question but I can't seem to find the answer, also does this mean that I still wouldn't be able to update itunes? Thank you.. :confused: