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.

AT&T, for example, says customers can unlock their phones within 60 days of activation if they’ve paid off their phone in ...

Network carriers T-Mobile and AT&T released their response to the rule this week. The proposal would require carriers to ...