I have a 3GS that is having major charging issues. I have replaced the battery and dock, but problem remains. When...

Problem probably occurred during your restore. The phone has lost its baseband files. Do a restore in DFU mode

This is NOT a software issue! The aftermarket screens allow too much light into the proximity sensor. The Fix:: Black electrical tape. Cut two small holes with an Exacto knife (about the size of a ballpoint pen) exactly large enough to fit over the two sensors. Cut out the holes so that you have a small rectangle with two holes. Place the rectangle over the proximity sensors and the holes should line up. That's it! Reconnect the "faulty" screen and...VOILA!