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Cause 1 of 4: Your Apple Watch isn't correctly set up for mobile data.
Several functions on your Apple Watch use mobile data, e.g. when making or receiving calls, sending email messages and listening to the radio.
Solution: Set up mobile data on your Apple Watch.
Find "Mobile Data"
On your phone: Press Watch.
On your phone: Press My Watch.
On your phone: Press Mobile Data.
Set up mobile data
On your phone: Press Set Up Mobile Data and follow the instructions on the screen to set up mobile data.
Or select...
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