Pull the SIM while it's on and see where it gets you. What network is it and/or the SIM. Try this: http://osxdaily.com/2012/08/20/field-test-mode-iphone-signal-strength-numbers/
And also try to enable roaming. If there's a tower you know of somewhere, you should see if you get a signal right next to it.
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'''Update'''
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@theimedic look at this thread that just popped up: https://www.ifixit.com/Answers/View/257780/Constant+searching%2C+no+signal.
Pull the SIM while it's on and see where it gets you. What network is it and/or the SIM. Try this: http://osxdaily.com/2012/08/20/field-test-mode-iphone-signal-strength-numbers/
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And also try to enable roaming.
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And also try to enable roaming. If there's a tower you know of somewhere, you should see if you get a signal right next to it.
Pull the SIM while it's on and see where it gets you. What network is it and/or the SIM. Try this: http://osxdaily.com/2012/08/20/field-test-mode-iphone-signal-strength-numbers/
And also try to enable roaming.