There are a couple benefits of using Wifi? Calling. If you are in a location with poor or spotty service, but have a good wifi strength, then this will be an option. If the network is congested, then wifi calling might help get your call through. And last, wifi calling does not incur any charges at all. This might not seem like much when you have unlimited calling, but if you were traveling outside of the United States, then wifi calling will allow you to call back home at your hotel or any other reputable wifi connection. You could be out all day, come to your room, connect your phone to the network, and get any voicemail that you might have. You can then call the people that left you messages as well as other important people. Since wifi calling does not consume cellular resources, there is no costs for the call. It is just like a FaceTime, or WhatsApp call.