Apple
How to Turn on Verizon WiFi Calling on iPhone
Apple and Verizon just delivered an update that allows users to turn on Verizon WiFi calling on the iPhone. This will let you make calls and receive calls on WiFi so that you don’t miss out when you are in poor coverage. We’ll explain what Verizon WiFi calling is and how you can set it up on your iPhone running iOS 9.3 or higher.
Once you set up Verizon WiFi calling on iPhone you can make calls over WiFi, like when you are in a building with poor signal strength, which allows you to stay connected. Unlike FaceTime Audio, you can use WiFi calling to reach any phone number on any carrier or device, and even home phones.
There is no additional charge to use Verizon WiFi calling. It simply uses your existing phone plan to make the call. One of the major benefits is that you can call U.S. numbers free of charge — even when traveling internationally, as long as you make them over WiFi.

What is Verizon WiFi calling on iPhone and how to set it up.
You’ll need a monthly Verizon plan as pre-paid plans do not support WiFi calling on Verizon at this time. To use this you will need an iPhone se, iPhone 6, iPhone 6 Plus, iPhone 6s or iPhone 6s Plus. You will need to turn on Advanced Calling on your iPhone, which will require you to login to your account or to call Verizon to add Advanced Calling.
Making a WiFi call on Verizon does not use your plan data, but it will use the WiFi data at about 1MB per minute for audio and 6-8MB for a video call.
How to Set up Verizon WiFi Calling on iPhone

What you need to know about Verizon WiFi calling on iPhone.
You can set up Verizon WiFi calling on iPhone without going to a Verizon Store or without calling to change your plan if you already have HD Voice enabled. Sometimes HD Voice is also known as Advanced Calling 1.0.
You can see if you have this already turned on by logging into your Verizon account, clicking on Manage My Account and then on Change Features. Next click on Add Advanced Calling.
Once that is set up you need to follow a few simple steps on the iPhone to turn on WiFi Calling.

How to Turn on Verizon WiFi calling on iPhone.
Tap on the Settings app on your iPhone home screen. next tap on Phone in the Settings menu. Then tap on Wi-Fi calling.
On the next screen you will set up an Emergency Address and confirm that you understand how this works.

Set up Verizon WiFi calling on iPhone with your emergency address.
Toggle Wi-Fi Calling on This Phone to On. Read the pop up warning and if you agree tap on Enable. Enter an emergency address that will show up for 911.
In order to allow Voice Calls over the Internet Verizon must allow 911 calls and include an address. This is the address that 911 will get if you call 911 over WiFi and are unable to provide an address to the operator. This does not change your billing address.
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