Smart Phone from USA for Mexico?

I have an iPhone SE which is an iPhone 6 in the smaller iPhone 5 package. i love it!

I figured if I had to relearn how to type with my thumbs, I wanted BIGGER keys. It helped a lot and I have large hands for a female. With the cover I bought for it, it's actually smaller than my wallet... so size is relative and it goes in my purse anyway.

I switched from Telcel to AT&T. I didn't want to fuss with recharging my plan every twenty-odd days. AT&T would accept a credit card plan and not assume I was out to stiff them. So far, no problems with coverage at all.