Why won't my iPhone 4s let me update my software to IOS 6?

I've tried everything to try to get it to update! It's really starting to piss me off to the point of wanting to get rid of my phone and going back to my old android phone! Anything that may help is appreciated.

Added (1). I have 3gb available, so that isn't the problem. It says it's installing, then an error message pops up.

I guess because it has no space available. Try to free some 2 GG

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