AT&T has just rolled out Wifi Calling for the iPhone 6 and 6s. This feature was previously limited to subscribers in the Houston area but is now available nationwide. AT&T was the last holdout on the technology but they have finally made the switch (Verizon, Sprint and T-Mobile already participate). This feature allows your iPhone to make and receive calls and/or Text messages when cell service is spotty or non-existent, over your phones’ WiFi connection. To turn on Wi-Fi calling, go to Settings > Phone > Wi-Fi Calling, and tap the slider to turn it on. No more having to deal with buildings that have poor signal, or interference if your home has a bad cell signal. Just turn on your Wi-Fi and make your calls over the internet. Happy calling.