Hello. I have an iPhone 4s locked to AT&T U.S.A. He had iOS 5.1.1 and tried to use with R-SIM 7 and Gevey Ultra S. No one of them worked. So i updated to iOS 7.0.4 and tried to unlock whit R-SIM 7, R-SIM 8, Gevey Ultra S, X-sim . With no one of them my iPhone get signal. He start searching and after 4-5 minutes shows me "no service" message. The phone see the SIM numbers, and SIM applications. Do you have any suggestions to get me guys? I tried resseting network settings many times, and no success.