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I am also facing problems with my 3G connection after upgrade my Iphone 4 to iOS 4.3.1. My firmware version is 01.59.00 and my Iphone is correctly Unlocked & Jailbroken. Everything else is working just fine, except for the 3G, although it appears the 3G syrabol on top and it shows that is trying to request data when I get in any site over safari or other apps. Before upgrade it always worked fine. My carrier is Claro on Brazil.