Default [Q] Switching a Iphone 5c from At&t to Verizon

Hello, my friend is offering me his "old" iPhone 5c, the only thing is that he bought it from at&t(his carrier). Would it be possible for me to get the phone and change it so that i can use it on my Verizon carrier? I would also like to get it to be on my plan.

Please let me know if this is possible. I did search around the forums but i couldn't find anything exactly like mine.