1. Check whether your watch has a phone app.
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2. Update androidwear China app to the latest version (1.4.0.2793218).
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3. You need to enable Bluetooth calling on your watch.
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Enter Watch Settings > Bluetooth, set the watch answering function to enable.
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4. Make sure your watch and phone have a Bluetooth audio connection. You can enter your phone Settings. Bluetooth, tap the paired watch to see if your watch phone audio is turned on. (It has nothing to do with whether the androidwearapp shows whether the connection is disconnected)
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5. If your phone is connected to multiple devices that support calls, only watch devices with mobile audio enabled in the phone Settings can make calls.
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6. Ensure that your mobile phone call function is normal and the mobile phone is not overdue.
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7. If the problem still persists, try restarting the watch.