Originally Posted by
Xyzzy
Some phones have Wifi calling built in
It doesn't have anything to do with these.N
.
Incorrect. Wifi calls, aka UMA, is charged to your bucket of minutes. Obviously, if you are on anunlimited plan, it's academic.
Originally Posted by
remyontheroad
I read some of the FAQs and discussions on their site, but I just think I'm still missing a piece of the puzzle here... how T-M interacts over Wifi.
This is the wiki link:
http://en.wikipedia.org/wiki/Generic_Access_Network
Essentially TMO marketed this many years back whereby you could make calls over wifi with specific phone models. Back then selected Nokia, Samsung and BB had UMA built-in, now it's expanded to variety of their Android phones. The advantages were two fold: in poor reception areas, you could piggyback onto a wifi to improve call quality; and for international travelers, free calls back to states without incurring international roaming charges.
For whatever reason, it was never widely marketed, other carriers didn't adopt it and not as well-known to general consumer [POV]. I keep an old BB 8820 that has this feature built-in. But with skype, line, wechat, etc., many other options for free international communications.