I managed to jailbreak my iphone (was a german iphone) to use with uk vodafone contract all was working great until I stupidly upgraded from iPhone OS 3.0.1 to 3.1 now it doesn't work at all! Not sure whether to rejailbreak on 3.1 (is that possible and easy-ish?) or to revert back to 3.0.1 and can I do that without it being broken on 3.1..? I have tried to revert back to 3.0.1 and nothing happens. Thanks.