Giving a Verizon iPhone to an AT&T user?

Would I be able to give my Verizon iPhone 5 to an AT&T user and they use it no problem or does AT&T have to sell the phone for it to work?

I'm using a verizon galaxy s5 with att sims chip and I have no problem and it works perfect. So you should be able to do that!

You can give your Verizon iPhone 5 to the AT&T user but the phone has to be unlocked before you can use the phone on AT&T. If you need help with getting the phone factory unlocked, mail me for more info.