No problem. I was quite surprised myself.
If you think about it, from a tech standpoint, its nothing all that great. FYI: all voice and data is already digital, and going as packets. There is no reason why the packets can't be routed over wifi than cellular towers right (other than a business decision). T-mobile had introduced their Wifi calling way back in 2007 (Yes it worked on a non-smartphone like my old Nokia 6086 ) Even in those days, it supported handoff. What it didn't support is ability to connect to wifi using modern standards like WPA2, captive portals, hi-def voice etc. (cause those phones weren't even smartphones to have those features)
But really .. its nothing all that "wow". If at all, we're like 8 years too late to make wifi calling a commodity. Imagine, over the years, the number of people who would have benefited from having wifi calling in their iphones when their AT&T signal sucked All those blokes in their high rises in NYC, Houston, etc.
PS: nokia 6086 review here: http://www.cnet.com/products/nokia-6086-t-mobile/
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