From AT&T's website:
International data roaming can get expensive quickly. For example, opening an email with a 5 megapixel picture in it, or downloading a 3-minute video on YouTube, each takes about 2 MB of data. The cost would be almost $40, based on pay-per-use international data rates of $0.0195/KB.
$24.99 per month - 20 MB Data Global Plan (Overage is $0.005/KB)
Translation: Good thing I checked this before leaving. Options: Turn off data entirely while out of the country, or pay at least $25 to check email in the mornings and hope I don't need Google Maps.
Sending Text Messages When Outside the U.S.: $0.50 per message sent. Home package rates apply to all text messages received when roaming internationally.
Translation: You can send, but I may not respond. This seems somewhat lenient for AT&T.
Calling and Traveling to Canada: AT&T Canada ($4.99 per month; $0.59 per minute while roaming in Canada.)
Translation: I can pay $4.99 for the right to only pay 59 cents per minute to use my phone in Canada. Without this plan, it costs 79 cents per minute. The break-even point on this is 25 minutes. Will I use my phone for more than 25 minutes the whole time I'm in Canada? Hmm...
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