Bought an iphone 5 off someone, how do I activate it?

I have an iphone 4s currently, and my friend actually sold me his iphone 5 for cheap because he bought one with more memory. My question is, how do I set it up? Can I just call up sprint and make the switch over the phone? Or do I have to go into the retail store?

Calling is always easier to do so call first. If you have to go to a Sprint Store, they'll tell you.

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