Hi everyone, I have just brought a iPhone that is on 4.0.1. I JB it and installed ultrasn0w to unlock it Now when I put my sim in the phone it shows full signal and displays T-Mobile in the top left corner but I cant make or recieve any calls at all! when I try and dial any number it almost instantly says 'call failed' beeps three times and displays a pop up saying call forwarding active, with a dismiss button I also cannot send text messages, But I can use 3g without problems :-7 I have read load and have tried changing the time/date settings, show caller ID, disabling flight mode/3g etc and nothing seems to work! It was a fresh install of 4.0.1, all I have done is jailbreak it and unlock it. Does it need activating or something??? Please can someone help me!