In June, Apple(s aapl) said Wi-Fi calling was coming to the iPhone and on Monday it delivered, according to 9to5 Mac. That’s the good news. The bad news is you can’t use the feature unless you’re running beta 3 of iOS 8, which Apple released today. That means most iPhone users will have to wait a few months for until the official launch of iOS 8 to make calls over Wi-Fi.

Here’s a peek at the Wi-Fi calling settings in the beta software as tweeted by Matthew Miller.

T-Mobile(s tmus) has long supported Wi-Fi calls on various handsets over the years to help customers that had inadequate cellular service in their homes or offices. It has never had native Wi-Fi calling on the iPhone, however, because iOS didn’t offer the feature. This fall, that changes with iOS 8. The next step would be for Apple to bring Voice over…