Can you use a Verizon iPhone 5s on AT&T without unlocking it?

Or does it have to be unlocked i just wanna know i'm gonna buy this iPhone 5s from my friend but its Verizon and i wanna use my AT&T sim for it do i just put the sum card in the phone? Or get it unlocked its for AT&T go phone but i'm currently using a iPhone 4

No you can't, if it is locked to Verizon then nothing but Verizon can connect unless you pay to have it unlocked.

Has to be unlocked.

You've to get the phone unlocked before you can use it on AT&T. If you need help with getting the phone factory unlocked, mail me for more info.

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