Got back from Cancun last week. The Go Phone worked flawlessly and as advertised, I only paid $0.25 / min.

Was long distance to Canada included in the $0.25/minute?

Yes, I called both the U.S. and Canada and it was always $0.25 all-in. Received text message after each call telling me what the cost was.

Has anybody used the Go Phone to call a Mexican number (landline or mobile), from within Mexico?

I'm assuming it would cost the same as calling from the US (25c + a surcharge for an "international" call), is that correct?

And the roaming coverage is on Telcel only, not Movistar?

For many of the gringos around here it could make more sense than a Mexican phone (especially as they can operate it in English!).

Is a dual band (850/1900) GoPhone adequate for Mexico roaming, or is quad band needed? I'd be using it in Mazatlan, Puerto Vallerta and Cabo San Lucas. Was hoping to get by with a Nokia 2320 -- voice only, don't need data.

Thanks!

(850/1900) should be adeaquite.
 

Yes, it should suffice:
PrePaidGSM: Mexico

Muchas Gracias!

I am currently in Mexico and the gophone is working great. Calls to US or within Mexico (landline or mobile) are always 25 cents. Calls to overseas (Europe) are not possible. However, I am using an calling card service which allows me to make calls to Europe.

Many thanks for the information on calls within Mexico, good to know.

Now this is interesting. 25c/min is only 3 pesos per minute. For incoming calls that is much cheaper than Telcel Amigo prepaid when you are outside of your area, (5 pesos/minute) and much cheaper for outgoing calls within Mexico. Telcel charges between 4 pesos and 7 pesos for this! When I was last there it was cheaper calling USA from my Telcel than calling elsewhere in mexico! They really have silly rates!

Next time I will try pick up a GoPhone!