Not sure if you guys can help with this, but I hope so.
Had an S5 Active w/ a Gear Classic watch, synced with AT&T Number Sync. Loved it.
Got the S8 Active a couple days ago. I have the watch connected through bluetooth, but every time I try to do the NumberSync thing, I'll eventually get to a screen on the watch that says 'Mobile Service Unavailable' and I can't sync.
Yes, I tried rebooting the watch. Yes, the SIM card has been removed from the S5 and it has been factory reset.
Going to try to call ATT tech tomorrow, but I'm not sure I'm gonna have time, and I work till late, and then it's the weekend.