Officially sucks! It appears if you have one bar of cell service that will carry the call. My wife has an iPhone and that seems to know to wifi the call even when there is some cell service. So, it would be nice if I could turn off the cell radio when home so wifi would be used. If I go airplane mode and then turn wifi back on it says I cant make a phone call with airplane mode turned on. So, wifi calling on the Droid Turbo 2 is useless...way to go Motorola and Verizon!