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IPhone 3G GPS is unreliable; seems to use assisted-gps only

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.