Device guides for
If you have problems receiving voice calls, there may be several causes of the problem.
Your missed calls are diverted after a specified number of seconds. If your calls are diverted too fast, you need to select a longer period of time.
Solution: Set call forwarding delay on the paired mobile phone.
If all calls are diverted, you won't be able to receive any calls on your Apple Watch.
Solution: Cancel all diverts on the paired mobile phone.
If you can't receive calls when someone calls you, it may be caused by an unknown connection error.
Solution: Restart your Apple Watch
If barring of incoming calls is turned on, you won't be able to receive any calls on your Apple Watch.
Solution: Turn off call barring on the paired mobile phone.
When flight mode is turned on, all wireless Apple Watch connections are turned off, including the mobile network connection.
Solution: Turn flight mode on or off