For Oreo and Pie OS navigate: Phone > Menu icon > Settings > Calls
As an alternative navigate: Settings > Network & internet > Mobile Network > Advanced
Tap Wi-Fi Calling.
Tap the Wi-Fi calling switch to turn on or off .
To proceed, review the Terms & Conditions then tap CONTINUE.
Ensure the Terms & Conditions option is checked.
Enter the emergency location information (E911) address then tap SAVE.
This info gets transmitted to the emergency dispatcher for all 911 calls made over a Wi-Fi network. If address validation fails then the users will be prompted to enter a new address until a valid address is entered
Upon successful validation of the address, Wi-Fi Calling turns on.
Power-cycle the device if not in the Verizon wireless coverage area or traveling internationally.