Good 3g reception, no edge
I received an iPhone from a friend's boyfriend a few days ago. The phone has problems, but I like a challenge. I was told he tried to replace the dock connector, and when he put it back together it had problems. I think I've already ordered everything I need to fix all of the problems except this one. I live in a town with no 3g coverage, were still on Edge. Most of the time the phone shows a very weak signal, or no service. Occasionally if I leave it in one place for a few hours, it will get a strong signal and I can text. I took the phone with me into the city yesterday, where there is 3g coverage, and it worked perfectly all day. I had a strong signal and was able to access 3g internet and text. I am already replacing the dock connector again (as he tore the microphone ribbon cable while installing it, and the assembly is incredibly cheap). I believe the antenna is located in the dock connector, so would this fix the problem?
Reset network settings
Restored in iTunes twice (without restoring back up)
Reinserted Sim Card multiple times
The parts to fix the home button won't be in for another two weeks, so I am not able to enter DFU mode.
Thank you for your help.
Edit: I thought I should include a list of all the problems in case it is related to something else.
Shutter won't open in camera app - ordered replacement camera (and tried restoring, ect)
Home button ribbon connector was damaged - ordered replacement (works when you connect the contacts on the dock connector)
Mic ribbon cable ripped in corner, very muffled mic - dock connector assembly ordered
Wifi and GPS appear to work perfectly, and the battery holds a charge nicely. The back cover is cracked around the headphone jack, sleep button and mic mesh - A replacement back was ordered too.
Is this a good question?