Does At&t Have Coverage In Mexico. The way I have it entered in my phone with just the area code and phone number. I keep a US.

Calls to countries other than Mexico the US. And primary usage must. ATT has 68 4G coverage of the contiguous United States and 70 3G coverage.
What level of service do you have with ATT.
If you have an older unlimited plan then no. See ATT Passport for details. ATT today announced new roaming benefits that will let ATT customers use their plans including calls text and high-speed data while traveling in Mexico and Canada just as if they were in the USA. Learn more about the legend.

