Fresh iOS 8 "restore" installation done through iTunes, on a 5S. Turned on T-Mobile WiFi Calling. Turned on airplane mode + WiFi enabled. Status bar carrier line says "T-Mobile WiFi", and shows full WiFi signal bars. Can make outgoing calls perfectly, and it works great. Voices sound like a best-case cell call quality. ... BUT, when people try to call me, they say it goes to voicemail, while my phone never rang. Anyone else have this problem? More importantly, anyone know how to *fix* this problem?