IMessage won't activate at all?

I have a sprint iphone 5 my phone is off right now but I still use it on Wi-Fi and i restored my phone and my imessage won't activate… Its so annoying i put ios 7 on it the other day and it was working fine because on 6.1.4 it was getting annoying… No one else is having this problem its just me ugh someone help me please

Get a windows.

Is your UDID registered? A lot of people have problems with iOS 7 when they haven't registered their UDID with a site like http://www.instantudid.com/. That's where I did mine. Just $5 and they do it instantly.

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