Tech giant Apple has released a new beta version of its iOS 9 mobile operating system to developers, and guess what: it includes support for Wi-Fi calling from AT&T and Sprint.

A number of cellular carriers are interested in allowing subscribers to make calls via Wi-Fi because it takes some pressure off already-overworked data networks and subscribers like it because it costs less and increases call reliability.

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Apple has built this option into its mobile OS and it has also added a cool little feature called “Wi-Fi Assist” that prevents iPhones from connecting to poor-performing Wi-Fi networks.

The feature might prevent a phone from switching a call from cellular to Wi-fi if the Wi-Fi signal does not exceed a certain strength threshold.

[Via]