Helio, which flamed out five years ago, is taking on the US wireless market with a new parent company and simple $29-a-month plan.
The company, which already offers free mobile phone service via Wi-Fi networks, is trying to make a name for itself with the introduction of a $99 Android handset.
The free-call bonanza now includes France, Israel, Italy, Thailand and the UK, among others.
The struggling carrier's Direct 2 You program, which brings a customer rep to a place of your choosing, now serves New York, Los Angeles, San Francisco and Denver.
You can make unlimited calls to a handful of countries and earn credits toward free calls to 85 others.
Curious about Wi-Fi calling and what it entails? CNET has the rundown on what you need to know.
The company's promotion will allow people to call Mexico all they want, as well as use their devices in the country, free of charge until 2016.
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.
Microsoft has developed a brand new browser for Windows 10.
By default, using "Hey Siri" to make a phone call uses the phone's speaker. But you can change that to use your car's speakers if your phone is plugged into your car's audio jack.