These seem like pretty routine questions but have you checked to see if another phone has the same reception problems?
Sent from my ATT Samsung Galaxy SIII using TapaTalk
If i helped hit the thanks button.
Current Device: Samsung Galaxy SIII (SGH-I747)
ROM: Stock Touchwiz Rom
Kernel: Stock 3.0.31-2024954
Previous Devices: Motorola Droid 1, Pantech Crossover, Motorola Droid X, LG Revolution, Sony Ericsson Xperia Play (r800x)