Sound is low in Mobile browser

When a user joins a meeting through a mobile browser, Voice quality is poor. Users need to put on headphones to hear.

Users are saying when the sound from our system does not come properly.
Can we in the server make the audio at the full volume / boost the volume?

Did they select “Speaker” as their audio device on their phones?

I’m using chrome browser not the mobile app,
in-browser any setting is there to increase the speaker volume?