After using Wifi Calling at home, work and on almost every wifi network I regularly visit, since I bought the phone at launch, my Sprint WIFI calling won't connect. It turns on, but just doesn't connect. Took it to Sprint today and they reset all network settings, to no avail, and finally did a factory reset, agin to avail. There hasn't been any updates in the past few day. Can't figure it out. Sprint kindly offered to send my phone in for repair, which leaves me without a phone for at least a week (and I leave for vacation in 3days...). Anyone have this issue or any ideas?