IPhone 4 stuck searching for signal?

I randomly checked my phone today and saw it was searching for a signal. And it had been searching for hours. I reset it, doing both a hard and soft reset. Took out the sim card and reinserted it. Turned on airplane mode for about a minute. Reset network settings. Nothing works. I've been trying to update to iOS 8.1 to see if that would work, but it says "unable to install update." I really don't want to have to restore my phone for the 4th time. How do I fix this?

IPhone 4 won't be able to install iOS 8.1 for hardware limitation. So your fix now is restoring the phone on iTunes.

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