GSM connection issues after battery replacementHello everybody! I recently repaired my broken/constantly depleting iPhone 4 battery using this iPhone 4 Battery Replacement ...
Answer to: GSM connection issues after battery replacementSolved the problem.. I did touch something else. I accidentally removed lower antenna connector up off its socket on the logic board when I removed the battery. It stayed in place but it was really loose. Now it's back on and I have full signal strength again. :) See Step 11 here iPhone 4 Logic Board Replacement I cleaned everything with cleaning-benzine and gloves to make sure its completely degreased. Hope this helps someone if he encounters the problem. If the problem persists one should also check the really small blue inductor that is on the left side of it (hidden under the logic board cable) but of course there is more on that in other threads.