Talk:Mexico/@comment-188.26.253.174-20160919215110/@comment-24682153-20160920042853

No, they don't. GSM providers can only roam with GSM providers. That's AT&T and T-Mobile in the US, not Verizon or Sprint. AT&T Unidos roams on AT&T, Telcel prefers T-Mobile, Movistar flips networks. For more info check this thread.