I don't know why T-Mobile doesn't advertise Wifi calling as the best thing since sliced bread; it's completely solved my issues with my cell signal dropping out as soon as I walk in the front door of my condo. My wife's Verizon phone has a weak signal in the house, but it's usable in a pinch. I'll admit that T-Mobile's signal is a bit weaker than some of the other carriers near my home, but now in my house it'self it's perfect (and I have no problems at work). Wifi calling was one of the features that really attracted me to T-Mobile (along with the no-contract plans), and I'm kind of curious how many other people see it as a make-or-break feature.
Would anyone else be considering a switch if Wifi calling wasn't available?