I recently changed the LCD on my iphone 4S. I took a lot of care when doing this and the logic board seems to be in great condition with everything else working, inlcluding the speakers, touch screen and wifi. But I can not get any signal from the sim card even though the iphone can register the sim card details, and says no sim card installed when I take it out.
I have tried a lot of the solutions people have suggested on here. I have cleaned all the metal contacts with alcohol, made sure the connectors are properly connected (well atleast I think they are) and even bought a new antenna, a new chassis, but nothing seems to have worked.
I have realised the emergency call didnt work, so would that suggest it is an antenna issue??
Any help at this point would be really greatful.
Regards
Mark