Yes, for those looking for more details, AT&T calls it NumberSync: https://www.att.com/shop/wireless/features/numbersync.html
Re:Amazon Echo Show
by toomuchtodo on Wednesday May 10, 2017 @12:24AM
(#14305907)
T-Mobile supports this as well.
Actually, not necessarily. At least with my provider (AT&T), I can set up my Mac as a validated device for WiFi calling, so I can do SMS and actual phone calls without using the iPhone as a relay.