Telcel (América Móvil) looks like the only game in town...

Thanks for all the info guys!

Mex: ...I'll be using the phone on the move, so yagi would be out of scope (maybe a short-range pocket-sized multipolarized pyramid for the city?). Movi is interesting, and has good coverage where I need it; a good alternative. Thanks.

I've decided to bring down a used unlocked phone I'll buy NOB...I found the cost range for bargain-basement phones a bit pricey across the various Mex carriers and vendedores.

Cheers-