(09-02-2013 10:37pm)mickydd Wrote: Looks as if the list of Wifi-calling devices is pretty limited. See link below of enabled devices.
http://www.wificalling.net/devices/
That list is far from complete. Actually, it's carrier dependent. In the US, T-Mo is the largest carrier with wifi-calling and almost every android (if not all) and every BBerry device they sell uses it. Rogers of Canada; Wind Mobile; and Cincinnati Bell -- which all use the same basic frequency set as T-Mo (and frequency seems to be important) -- have wifi-calling. In other words, you can't just go out and buy a wifi-calling enabled phone and use it on any network. They have to be designed for the network.
UMA was the original wifi-calling, and T-Mo had it on BBerrys and some Nokia phones for years. But as UMA required a hardware enhancement, T-Mo eventually switched over to Kineto. Their Android phones worked on this, BBerry on UMA. This meant that Android phones (on T-MO) could be upgraded to wifi-calling with an OTA software patch to Kineto. Now T-Mo has switched to IMS which still allows a phone to use wifi-calling w/o hardware enhancement. Wind, Rogers and Cincinnati Bell have stuck with UMA, I believe.
The biggest advantage of UMA is if you transition from an area with wifi to one w/o, your phone will pick up the cell network w/o dropping the call. Kineto and IMS can't do this. However, in theory, IMS and Kineto can be applied to nearly any phone.
Some US business rely pretty heavily on this service, and I have friends (w/BBerrys using UMA on T-MO) who no longer have land lines, because they don't even have to depend on getting strong cell signals (or ANY cell signal for that matter). If it's on the Z10, that's my next phone.