I read your Mexico Roaming Tips with interest as I prepared to travel to Mexico for two weeks. In lieu of using our family plan with AT&T for calls from and within Mexico, I followed your advice and purchased an AT&T GoPhone SIM card prior to leaving. The card arrived and within minutes our new Go Phone number was activated on our unlocked Treo from years ago.
Both of our cell phones were Forwarded to the GoPhone and we used the voice mail system associated with our Google Voice account to transcribe and email us our voicemail messages, which allowed us to check our voicemail at no charge via computer and determine which messages required immediate attention.
Just having the cost certainty of the pre-paid card was worth the effort. I won't have to wait a month or two for an extra $100+ to be lumped onto our monthly billing from AT&T. This was my first practical use of Google Voice. I tried to use Google Chat to place a call, but upon my return to the states learned that it is only
available from within the US at this time. Lots was learned during our two weeks there, but your article got us moving in the right direction!
The AT&T GoPhone still roams in Mexico at only .25/minute and is a good choice whether your home wireless phone is with AT&T or not.