Hmm... I don't see why Verizon even needs Wi-Fi calling. I'm a T-Mobile customer and have used the feature on my Nokia Lumia 925. It was okay, definitely not perfect, but I would get complaints from people I was on the phone with at times while using it. With my iPhone 6s, I've never had to use it thus far, which is great. Do you really need Wi-Fi calling on Verizon? My boyfriend used to have Verizon (he switched to T-Mobile as part of my plan early last year), and he would get service everywhere.