Did you try just dialing the number like you would in the US? That worked a few years ago with Verizon phones. That said, there was a change made recently for dialing Mexican cell numbers.I could not call my dive buddy from my US phone (verizon) to his US phone (verizon, I think) while we were both in Coz. I tried every imaginable combination of not using the country code to using +1 to 001, no luck at all. My phone would just quickly disconnect. What was going wrong?