I accidentally erased my original post about using your present cell phone while in Mexico. If anyone has any personal experience with this, please let us know.
Here’s a comment on my original post:
Verizon now offers a North American plan which for $120 a month for 2 phones gives you 1500 minutes anywhere in Canada, U.S, and Mexico. Mexican coverage is good enough to have about 100 towns with service in the state of Nayarit.