Originally Posted by paulmor
What do you mean by "wifi calling"? is it calling via wifi using SIP provider?
If so, we do have it on our Vodafone UK branded units.
If it's something else, please explain.
T-Mobile is a pretty cool system. When you're at home (or on a WiFi network that doesn't do much filtering), phone calls, SMS, and MMS inbound or outbound route through WiFi instead of the cellular network. I've noticed this has the benefit of improving battery life while on WiFi, as it turns off the WCDMA (3G/4G) radio. It actually seems like it might turn off the cellular radio completely, I'll have to check when I get home.
The one downside is that if you are on the phone and walk away from your WiFi network, it will drop the call. It can't hand off.
I'm not sure if this is common in Europe, but in the states, many wireless carriers offer femtocell units that users can install in their home if they have bad reception. WiFi calling eliminates the need for that.
kansei - cross-platform enthusiast extraordinaire (I might have an addiction)
HTC Inspire 4G CM7 nightlies
Past phones (last 2 months): Samsung Galaxy S 2 (Bell, unlocked for AT&T), Motorola Atrix, HTC Sensation 4G, LG G2x 4G, HTC Inspire 4G, HTC HD7S, iPhone 4 (white, ATT), HP Palm Pre 2