Originally Posted by JSanders
In this case with UMA, basically, Tmobile with UMA = Vonage, and your comcast cable in both cases is the transport.
The 8320 device with UMA = Vonage phone adaptor.
Ok, did some more research, and it looks to me like an 8320 with UMA still only works with a wireless router from that carrier, i.e. Tmo. At home, you would have to have a tmobile wireless router to make wifi calls and away from home, wifi calling only works when connected to a tmo hotspot. So, not like I could sit in any airport or hotel with standard wireless internet and make calls over wifi, right?