At least on T-Mobile, only carrier ROMs have Wi-Fi calling.
I have T-Mobile and my Nexus 5X has wifi calling.
I have been using Gnome 3 on Fedora for about a couple years now, and I honestly can't understand why people don't like it.
I completely agree. It took a while to get used to it, but once over that stage, I found that it didn't get in the way of what I was doing at all. The interface is simple and clean.
Credit ... is the only enduring testimonial to man's confidence in man. -- James Blish