Hey guys I need help with this phone. I did an unlock on a T mobile Galaxy SII T989 phone so I could use it in AT&T's go phone. It is a 4g phone and (when on T mobile) worked great on 4g. It works well on AT&T, all but the 4g. Does anyone know how to fix this glitch or is it just the way the phone was configured for T Mobile? Any help would be appreciated!!