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To your point about verification (or two factor authentication texts) they all work seemlessly as well, and are just as fast as when I'm in Canada. 

Fyi, the underlying service is AT&T where FYI, a per my previous message, for context, I am (Puerto Vallarta/Bay of Banderas). Not sure what part of Mexico you will be working from, so underlying service may differ for you. 

Yes, texts, calls, all working as expected, and both ways (sending/receiving). 

Same here. AT&T showed up as soon as I landed. Don't forget to turn roaming ON.

I'm in Puerto Vallarta and Bucerias, both areas, all services (calls & texts to/from Canada/US/Mexico), and data/apps all working as expected.