GoPhone unlimited texting includes international too?

Yes, the $60 "Unlimited Talk & Text" feature package that is available for the GoPhone with the "Simple" ($0.25/minute) rate plan includes text and IM to Mexico/100 other countries, but it does not include voice calls to those countries.

The regular "unlimited messaging" feature package ($19.99/month) that is available with any of the PayGo rate plans does not include messaging to international locations to my knowledge. However - and I wouldn't count on this - I've previously seen a number of people indicate that when they send messages to international locations the message has been charged at the domestic messaging rate ($0.20) or was deducted from their messaging package. So I don't know if that is intentional and at&t's GoPhone feature information on their website is out of date or if it's a billing system error that could be corrected at some point in time.

 

I get charged 50 cents for sending an international text with my regular unlimited messaging plan.

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That sounds wrong, you should only be charged $.50 for sending a text message when roaming internationally, unless of course AT&T has bumped up their prices yet again. The standard rate (which they seem to be able to bill correctly for postpaid accounts) is $.25 for a message to international destination. Of course that means that messages longer that 160 Latin-1characters (or 67 UTF-8 characters, assuming AT&T hasn't dropped their Unicode support completely) would cost more in $.25 increments, so maybe that's the case with you

The last time I checked with prepaid (PAYG) they indeed failed to bill appropriately and were just taking international messages out of the 200 message package.

 

IIRC I was charged 50 cents for sending "Happy Birthday & Many Happy Returns Xxxxxx, love Yyyyy & Zzzzz" to my niece back in April.

Maybe, I should ask for a 25 cent credit..

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You should've done so in April If nothing else, the satisfaction of knowing your call to CS has cost AT&T more than the $.25 they swindled from you would be good