Is it possible to use an AT&T iPhone on Verizon Network?

I'm wondering if it is possible to use an iPhone from AT&T on the Verizon Network. My coworker has an old one and is willing to give it to me but I'm not sure if I could use it on Verizon since I do not want to switch to AT&T. I read something that said it was impossible from T-Mobile to Verizon but I didn't know if it was the same with AT&T.

AT&T iPhone can't be used on Verizon.AT&T takes SIM but Verizon doesn't.