The free-call bonanza now includes France, Israel, Italy, Thailand and the UK, among others.
The fixed wireless voice terminal lets users take inbound cellular calls from traditional home phones.
Application users on Android can place domestic and international calls to outside lines for a monthly or per-call charge.
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.
Frontier Communications will pick up parts of Verizon's landline business, while American Tower will pick up the rights to 11,300 cellular towers.
The company is close to selling off parts of its wireline business and cellular towers for $10 billion so it can focus on its core wireless service, The Wall Street Journal reports.
The carrier previously charged 1 cent a minute to wireless and landline numbers in Mexico.
As it rolls out a new version of Skype for iPhone, Microsoft announces it's recruiting users to test out pre-release versions.
Buy any Internet-connected gadget from Tesco, including the supermarket's £119 Hudl tablet, and you get a year's broadband for nothing.
You can make unlimited calls to a handful of countries and earn credits toward free calls to 85 others.