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Why wouldn't you upgrade? I mean come on.. If you don't like the iPhone 5, just upgrade to an iPhone 5, sell it and buy an iPhone 4S AND you'll end up with some extra cash as well.
 
My wife upgraded from a 3G to a 5. I have an iPhone 4 from work.

If you have the opportunity, I say upgrade to the 5.

I got my wife one of Speck's Candyshell cases for her phone. I think it is a very nice set-up.

I've love to get an iPhone 5 for myself, but I just can't justify it.
 
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