Getting started
Basic use
Calls and contacts
Messaging
Apps and media
Connectivity
Specifications
Cause 4 of 5: There's an error in the operating system on your Apple Watch
If mobile data doesn't work on your Apple Watch, it may help restarting it.
Solution: Restart your Apple Watch.
Restart your Apple Watch
Press the Digital Crown and the Side button and keep them both pressed until your Apple Watch restarts.
Or choose...