Open the Settings app
Tap Cellular or Mobile Data
Tap Wi-Fi Calling
Turn on Wi-Fi Calling on This iPhone
Enter or confirm your emergency address if prompted
Follow any carrier prompts to complete activation
Connect your iPhone to a Wi-Fi network
Check for the Wi-Fi calling indicator in the status bar or Control Center
If needed, restart your iPhone
If Wi-Fi Calling does not appear, contact your carrier to confirm support and activation