IPhone isn't connecting to Wi-Fi? - 2

It's NOT my router or anything. It's working on my iPad and computer.

I looked it up on apple's website and it said try resetting your phone and I did that, but it didn't work.
It also said try restoring your phone and I did that, but once again it didn't work.
Can I send it into apple or my sprint store and have it replaced?
Also my lock button is broken and you have to push hard to lock it.

I have a black iPhone 4S and I just got it Christmas 2012. Also if they will replace could i request a white one?

My friend had the exact same problem. We booked an appointment with genius bar and showed them the problem. They replaced with a new iPhone 4S. However, I don't think they will replace with a different colour but worth a try.

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