When I got to work today I realised I'd left my iPhone at home. So I was very surprised to receive an SMS text message (not an iMessage) on my Apple watch. And, I then replied. In the left-most of the "glances" (that contains the flight-mode, do-not-disturb and silent mode toggle switches) it has the green "Connected" text, and to the right an iCloud icon. How cool! Nb. I have "known" wifi networks at work and home.