Some of the packages we recently found in the 3 of the mayor carriers are:
AT&T in October 2014 changed up its international plans a bit, offering the same packages in either a one-time shot, or in recurring monthly instances. Prices remain unchanged, as do the data buckets. The biggest change is the inclusion of unlimited Wifi. You also get unlimited text messaging with these plans.
Here's how it breaks down:
$30 for 120 megabytes of data, 25 cents/MB overages, calls are $1 a minute
$60 for 300 megabytes of data, 20 cents/MB overages, calls are 50 cents a minute
$120 for 800 megabytes of data, 15 cents/MB overages, calls are 35 cents a minute
$40 for 40 megabytes
$80 for 85 megabytes
$10 per megabyte if you go over
$25 per 100 megabytes
No overages. You just get charged another $25.
If for some reason you want to pay as you go, it's about $2 in Canada, $5.12 in Mexico and $20 per MB in the rest of the world.
The bottom line when traveling outside the United States, it's less expensive to get a Global SIM card, that will not only give you data but also voice and SMS
without contracts, monthly fees or any surprise