No Signal on iPhone 3G

[Alex Kiraly]

Hey, I had my iPhone 3G since 3 years now and i dropped it a few times. Suddenly, like a year ago, the signal started going down. I fixed this by toggling 3G, but since a while my signal was gone all the way. However, when i insert the SIM card it has full bars for around 5 minutes, and i am able to make quality calls and text in the first 2 minutes. After that, the signal disappears and it displays No Service. I tried the following:
- Replace the dock (antenna + mic + speaker + charging dock)
- Restore to 3.1.3
- Restore to 4.1.2
- Restore to Whited00r 6.0
- Check for the inductor near the antenna (it's there)

Any ideas? Seems like hardware-related

 

[WesleyBishop]

Did you try getting a new sim card?

 

[Alex Kiraly]

Did you try getting a new sim card?

Yep, still no solution. I suspect a crack on the motherboard, though i need a microscope to inspect that

 

[WesleyBishop]

Also sounds like maybe the sim card is not sitting properly because it starts out fine but then becomes degraded. Maybe the part that holds the sim is bent or old.