Doug is having trouble with using wifi calling on his older iPhone on Verizon. Leo recommends calling up Verizon and request a Femtocell (microcell). Verizon calls it a 4G Network Extender. The FemtoCell offers cellular wifi calling in areas that cellular coverage doesn't work well. It's essentially a mini cell tower connected to your wifi. And if you are nice and tell them your service won't work in your home, so you may as well not be a customer, they should send it to you for free. Don't pay for it. Just tell them that if you can't use your service at home, you are going somewhere else.