From the Home screen, tap the Phone icon.
Tap the Menu.
Tap Settings.
Tap Calling accounts.
Select your carrier.
Tap Wi-Fi Calling.
Tap or slide the Wi-Fi Calling switch to On.
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.
You've completed the steps!
