From within the Settings app, scroll to and tap Phone.
Tap Wi-Fi Calling.
Tap or slide the Wi-Fi Calling on This iPhone switch to ON.
Tap Enable.
If this is your first time enabling Wi-Fi calling, your carrier may prompt you to agree to terms of service and enter your address so any emergency calls you make can be routed correctly. You can update this address at any time.
You've completed the steps!
