If you want to stop using your mobile device to make/receive calls of your Fixed Voice Number, you can deregister your device from the JioFiberVoice number through a few simple steps.
Ensure your phone is connected to the JioFiber ONT through Wi-Fi.
In the JioJoin app, go to ‘Settings’ and select ‘Manage Fixed Networks’
Select the JioFiber Voice Number and Remove
A pop-up appears to confirm that your device has been deregistered with the JioFiberVoice number.