thnxx all .. no its not from AT&T but vodaphone.. i was in UK, but now in mtius, and here they dont have vodaphone... i'd like to know whether jailbreaking has any adverse effect on the phone ?

Hey guys... i want to know if it is possible to unlock my iphone4 8GB (iOS5.0 modem firmware :04.11.08) WITHOUT JAILBREAKING IT???