Once you’ve unlocked your Straight Talk phone, you can bring it to AT&T if you want, as both carriers are GSM-based. Can Verizon unlock an AT&T phone? No, as with Straight Talk, carriers can not ...

Competitors like AT&T and T-Mobile are GSM carriers, so you may see differences ... Here are our top three recommended picks: Unlocking a Verizon phone is as easy as can be. All you have to ...

While the best unlocked phones almost certainly support GSM carriers like AT&T and T-Mobile, it’s best to look for devices that work with all the major U.S. providers, including Verizon.