A few months ago the GPS in my 3G has become really unreliable. The blue circle in google maps looks to be about 2 miles in diameter, and never shrinks to a pinpoint. Apps like RunKeeper can never get a strong enough GPS signal. This may have coincided with the iPhone not picking up wifi unless almost on top of the access point, but that could have been a coincidence.
Things I've tried that haven't worked:
- Trying to lock on to a satillite when outside with clear skys for >30 minutes
- General Settings -> Network -> Cellular Data -> Reset Settings
- Restoring the iPhone from a back-up
- Giving the phone a prelonged stern look
Any ideas greatly appreciated.