In late 2017, Wear OS users reported via Google's issue tracker that Bluetooth call audio was thoroughly busted. Then, they waited... and waited. This has been going on for so long that Wear OS was still Android Wear when the issue was initially reported. At last, we're getting confirmation from users that the bug has been patched in Android 9 Pie. It only took Google 10 months.
This was a particularly annoying bug for Wear OS users because it affected multiple apps and you might not even realize it's the watch at first. You're supposed to be able to move call audio between the phone and watch (with a speaker) by enabling the "Play phone voice call on watch" feature.Read More
Android Pie finally fixes the Wear OS phone call audio bug after 10 months was written by the awesome team at Android Police.