Wifi calling?

The Radar has WiFi *data* but I don't believe any Windows phone supports WiFi *calling.*

(For those who aren't familiar, WiFi calling is a feature T-Mo introduced a while back that allows you to place phone calls over your WiFi connection when you've got one instead of using the GSM/HSPA+ network. If you have the right plan, the minutes don't come out of your allotment either. It's great if you're in the basement and get lousy signal there, or if you're in an area that doesn't have good GSM coverage.)
 
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Are you all SURE this works? When turning off cellular, you're turning off your phone's cellular DATA (says so right there next to the cellular toggle switch). This doesn't turn off cellular VOICE functionality, AFAIK. In other words, just because you turn off "cellular data" and can still make a call, I don't think that means you're calling over WiFi...
 
I think you're right. I just put my phone in airplane mode and turned on wifi, and I can't make calls. (which I could do on my Blackberry, which had true wifi/UMA calling)

#bummer