You are correct. Only IPhone 6 and newer. Here is more for iPhone users:
It extends the network coverage area for call and text, especially if you're in a region with poor cellular coverage.It's easy to set up. There's no need to download an app or log in to your XFINITY Mobile account. Once you have it enabled, it just works.WiFi calling becomes even more useful when you're traveling internationally. You can use it to call and send text messages to U.S. numbers for free when you're in another country, saving you international long distance charges.
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