So I just bought a OnePlus 12 recently, I was used to controlling volume using the onehand operations goodlock module in my Samsung galaxy S23. I basically never had to press the volume buttons to control the volume unless absolutely necessary.

Possible ways I’ve thought of (it would be really great if at all possible) -

1. Using the curved edges in phone screen for volume control.

2. Using the gestures to control volume when the screen is off.

3. Setting Diagonal swiping gestures to do different functions, controlling volume in this case.

EDIT :

4. One can also use gestures like tapping the body of the device as well.

Basically I use this app called ‘Tap Tap’ which enables me to double tap the back of my phone to execute some task.

In this case I set the double tap to reduce volume. It brings up the slider and I can control the volume from there.

I hope this will be helpful.