Most of you probably already know this but, regardless of your carrier, you can make outgoing calls via wifi by using the Hangouts Dialer (a separate app from Hangouts). Doing it that way works much better both in terms of call quality and battery usage.
I just got an N6 and that's the only way I can make calls since I don't yet have the sim that I ordered.
Irrelevant and completely different.
Well, it is different, but I wouldn't say irrelevant. The primary purpose for T-Mobile's WiFi Calling capability is to extend your phone service to areas where the signal is poor or non-existent. With the addition of the dialer to Hangouts, people can now still make and receive phone calls solely over their data connection, whether it be WiFi or Mobile (yes, it works across your mobile data connection as well).
And.... unlike your 'regular' phone number... With Hangouts, you can send and recieve those calls without even having your phone with your (you can make calls from a tablet or desktop)
I am not so sure the extent of Hangouts' calling capability is widely known.
I know. But people can't reach you on your number. Not the same. I know, you didn't claim it was, bit I dont like when people post as if it's just as good.
On your carrier number... correct. But anyone can call your Google Voice number and get you.
To be honest, when I switched from Verizon to T-Mobile, I asked if I could port my number to Google, but they said that I needed to port the number in order to get the ETF covered. Ideally, I'd have my 15+ year old wireless number pushed up to Google and just forward to whatever phone I want.
Maybe I'll revisit this one day and see if T-Mobile will play ball a bit....
What if you just started the port on Google's site now?