In iOS 9, you can make regular phone calls through Wi-Fi (if your carrier supports it). The feature is called Wi-Fi calling and is not very different from VoIP where you make calls through the Wi-Fi or data network. Where it differs from VoIP (other than the core technical stuff) is that Wi-Fi calling doesn’t involve any extra app, accounts or most importantly expenditure. All it needs is a Wi-Fi connection, an iPhone running iOS 9 and a carrier that supports Wi-Fi calling.
Currently, T-Mobile (US) and EE(UK) support Wi-Fi calling. Users who are on T-Mobile or EE can make Wi-Fi calls from their iPhones. You just make a call as you’d normally do – but the carrier name on the status bar will change to “T-Mobile Wi-Fi” (or EE WiFi). That’s an indication that you are making a Wi-Fi call.
Here’s How to Enable Wi-Fi calling on your iPhone 6s:
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If Wi-Fi Calling is available on your device, you’ll see Wi-Fi Calling on This Phone. Tap on the slider to enable this feature. Also, make sure to read the fine print, as they may differ from carrier to carrier. Once you tap the slider, you receive a pop-up message and must tap Enable. Once you switch this on, you will be able to make calls through Wi-Fi instead of cellular.