My iPhone 4 won't let me install iOS 6?

I downloaded it but now it won't let me install it. It says "Unable to install update." I have 3.9 GB available and my phone isn't jail broken.

Mine had the same problem with iOS 5. If you just keep trying a couple of times, and make sure it is plugged in, it should work. If you are trying to do it straight from your phone, try doing it on a computer.

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