If the volume is very low when combining a Devialet Gemini and a Android Phone, this is because of a specific setting on Android.

You will find below the steps to remove this locker.

• Go in the settings of your device on System.
• Then you will have to select “About this phone”.
• Press 7 times on “Build number”.
• You will then have the Developper Options.
• Go back into the system pages and select Advanced settings.
• Select "Developpers Options"
• Toogle the option named Bluetooth Absolut volume.
• Restart the phone.

In case this doesn't increase the volume, we suggest you to contact the manufacturer of your Phone to get more info on their settings.