I really don’t know, but you should visit this link http://www.iphone-geeks.com/iPhone-Help/can-a-att-iphone-5-work-on-a-verizon-network/
I hope some other iphone owner will know answer on your question. Cheers.
What is phone unlocking?
Phones are tied, typically via a software lock, to work on only one carrier’s network. That iPhone you got through AT&T, for example, is locked into that carrier’s network. Unlocking the phone means you’ve altered the settings on your smartphone (or even an old-school feature phone) so that it can be used on a different wireless network.
I can legally unlock my phone now?
Yes. Assuming it really is your phone. By which I mean, if you purchased a Samsung Galaxy S4 under a two-year contract with Verizon, and you’ve got a few months before that contract is up, then the carrier is (still) under no obligation to unlock that device. You technically do not own it.
There’s another catch. The new law essentially just requires the Library of Congress to restore its earlier unlocking exemption. The exemption itself is still not permanent. Rather, the Library of Congress must decide once again in 2015 whether to renew the exemption. That said, this new law plus market pressure are likely to make phone unlocking a de facto permanent feature of the U.S. wireless marketplace.
Can I take my unlocked phone to another carrier?
Absolutely. But, know that there will be pain. That’s especially true if you’re not using the very latest smartphones.
“Most U.S. carriers use different combinations of technologies and [radio] frequencies,” Avi Greengart, research director for Current Analysis, told me. Take your “fully unlocked” AT&T phone to Sprint, for example, and “the phone simply won’t work.”