Activating Wi-Fi calling
You can use Wi-Fi calling to make and receive calls in areas with limited or no cellular connectivity. If this option is not present on your device, or cannot be enabled, your carrier's network or your specific cellular plan might not support this feature.
1.
From within the Settings app, scroll to and tap Apps.
2.
Scroll to and tap Phone.
3.
Scroll to and tap Wi-Fi Calling.
4.
Tap or slide the Wi-Fi Calling on This iPhone switch to ON.
5.
Tap Enable.
If prompted, follow the onscreen instructions to enter an address. Emergency services use this address to locate you if you place an emergency call over Wi-Fi. You can update it at any time.
6.
You've completed the steps!
