The latest iOS 9 beta version brings support for AT&T Wi-Fi Calling and it seems the carrier finally flipped the switch to enable the feature.
When the new beta version rolled out last week, support for AT&T Wi-Fi Calling was present for the first time. In fact, however, it was only listed as an option, but AT&T did not actually enable the feature at the time.
It now seems the carrier finally enabled the feature on its end, as a number of iOS 9 users on AT&T now report that Wi-Fi Calling went live. Apple-centric publication 9to5Mac was the first to report on the matter after receiving word from its readers.
The new iOS 9 Wi-Fi Calling on AT&T works only with the latest iPhone 6 and iPhone 6 Plus and only in a limited number of regions for now. The feature, as the name suggests, enables users to make calls over Wi-Fi rather than cellular, which may help in situations when the cell signal is too poor for quality calls.
To take advantage of this feature, first of all you need to turn on Wi-Fi Calling. To do so, find the Wi-Fi Calling toggle in your phone's Settings > Phone and turn it on to get started on the setup process. It's a single toggle and you can turn it off at any given time.
Read the privacy details, agree to continue, read the agreement and accept the terms to proceed. Among others, the agreement notifies users that cellular would be better than Wi-Fi for emergency calls to 911.
Once you've read the terms and agreed to continue, you will find out whether the feature is available in your area. If AT&T already rolled it out, it should start working within a few minutes. If it doesn't seem to work, it means that AT&T has yet to enable the feature for your area.
Keep in mind, however, that both the agreement page and the disclaimer point out that this is a trial run, which means that the feature may have some hiccups for now. Only a limited number of areas apparently support the feature at this point, but iOS 9 Wi-Fi Calling on AT&T is expected to see a wider rollout soon enough.