The free-call bonanza now includes France, Israel, Italy, Thailand and the UK, among others.
You can make unlimited calls to a handful of countries and earn credits toward free calls to 85 others.
This is the third time that AT&T has added unlimited calling to Mexico in its different plans. The company previously brought it to World Connect Value and its subisidiary Cricket Wireless.
The carrier previously charged 1 cent a minute to wireless and landline numbers in Mexico.
At least one company says smartphones don't have to be rectangular slabs.
And why you may prefer to stick with one color or the other.
FreeTone delivers on its promise of free text messaging and calling within the US, but falls short on just about everything else.
One day after the FCC adopted new Net neutrality rules, consumers are left scratching their heads about what it means for their Web-surfing experience. Has anything really changed?
The popular messaging app appears to have switched on its promised voice calling feature, with some users reporting the functionality appearing in the latest app build.
European carrier giant Telefonica, parent company of the UK's O2, has embraced WebRTC technology so its customers just need a browser to make calls. Too bad about Apple's Safari, though.