Hi I have a iphone 4 16gb with 4.0 orginally on vodaphone so did JB and ultrasnow unlock tried several sim and all worked fantastic. Inserted my O2 sim after a chop from my current 3gs, only issue was no 3g so I download xsellize great, worked a treat asked if i wanted updated carrier settings clicked yes (was that the doh). Since No service when you chuck a sim in it says Restricted Network you go to carrier settings and it will either not find list or say the above. I have not had this problem any ideas. Mainly don't want to loose unlock as my O2 contact is up, so a swap may be coming. Do I need to start again and uninstall unlock and reset network settings has it got its self in a fix. Many thanks teadigger Back again stituation is changed got back carrier settings but still no service and still goes through the restricted network. uninstalled xellize and ultrasnow, do I need to restore using iclarified ipsw 4.0 and start again or will itunes force 4.2 on me.