Guys my mate tried using the red snow utility to update his jail broken iPhone 3GS from 4.2.3 to 5.1.1 he did this and always fine except he could get no service his device was locked to his carrier. He has now gone into iTunes and restored to 6.0.1 all works but still gets no service. What's he done wrong I thought iTunes would sort him can anyone help he is without a phone many thanks guys you know a lot more than I do