Could a sprint iphone be turned over to verizon?

My iphone 5 got stolen about a week in a half ago, and is now at the bottom of some creek. I don't have insurance so I can't go and get a replacement iphone, however, my friend is offering to sell me his iphone 5. The thing I'm worried about is his iphone was under a sprint plan. He recently purchased a new phone under his same plan so now it's just a "paper weight" iphone. My current plan is under verizon, so what I'm wondering is if I were to get his previous sprint iphone would I be able to reactivate it as a verizon iphone or does it have to be unlocked? Or is there no way that that could work.

Talk to Verizon, because it will vary by phone provider. Hope I helped.