apple watch series 3 sound low calling time

Hi

To adjust the volume on your Apple Watch, follow the instructions here:

Adjust brightness, text size, sounds, and haptics

To adjust the volume during calls, follow the instructions here:

Answer phone calls

The following steps may also help:

If you are using a case or other protective accessory on your Apple Watch, then it may help to remove it.

Check the speaker port for any wrapping or debris:

• A quick look at Apple Watch
• Cleaning your Apple Watch - Apple Support

Restart both your iPhone and your Apple Watch, turning both devices off together, then restarting your iPhone first:

• Restart your iPhone, iPad, or iPod touch - Apple Support
• How to restart your Apple Watch - Apple Support

If the issue persists, then I suggest that you contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:

• US: Apple Watch Service Answer Center - Apple Support
• Elsewhere: Apple - Support