Apple Watch has no sound during calls
No sound on watch while making calls
Apple Watch Series 3, watchOS 5
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To adjust the speaker volume during phone calls on Apple Watch, turn the Digital Crown while on the call or tap the volume symbols on the screen.
If this does not work as expected, it may help to restart both your iPhone and your watch. Turn both devices off together first, then restart your iPhone before restarting your watch:
- To turn your watch off: press and hold the side button until you see the Power Off slider; drag it to turn off;
- To turn it on: press and hold the side button until you see the Apple logo.