WIFI calling on Galaxy S5 not working at home
I activated WIFI calling successfully after 6.0.1 update. However, it took me a long time to get WIFI calling actually work at home, after a few resets (network reset, factory reset). Then I got to my work place, I connected to ATT WIFI hotspot and WIFI calling came on immediately. Then when I tried again at home, WIFI calling no longer worked. It still works right away when I connect to ATT WIFI hotspot.
What would prevent WIFI calling from working in my home network?
The way I tested WIFI calling was turn on airplane mode and then turn on WIFI.
Also my ISP is Frontier FIOS and it is a 50Mbs service. WIFI signal strength was at max. I will try WIFI calling at some non ATT hotspot to see what happens when I have time.