iOS 9.3 brings international WiFi calling to iPhones on AT&T
You won't have to pay additional charges, so long as you're on a WiFi connection.
If you've been waiting for AT&T's WiFi calling service to start working outside the US, you may want to install iOS 9.3 on your iPhone right now. It won't only bring Night Shift to your device, but also the ability to call from other countries without incurring additional charges. So long as the feature has been toggled on in Settings, and you're connected to a WiFi connection, you can make or receive calls abroad even if you barely have coverage. If you dial an international number, though, you'll have to pay your plan's usual rates.
It's definitely a welcome upgrade, but note that the feature only works with the iPhone 6, 6 Plus, 6s, 6s Plus and, when it's released, SE running Apple's latest mobile platform. Besides updating its WiFi calling service, AT&T now allows iPads and Macs connected to your iPhones via Numbersync to make calls on a cellular connection.
[Thanks, Vladimir Pimentel]
Update: The recipient does not need to have WiFi calling for the feature to work. It works automatically when you're abroad and can call any US phone number without extra charges.
