Whenever I try to make a voice / video call through the app, it says "Please use your phone dialer to make calls as this is a VoLTE phone"

This happens when your device's firmware has been upgraded to support VoLTE. You can check if your device supports VoLTE here:
You can continue to use JioCall for RCS feature such as: Chat, Group Chat, Location and In-call Share If you would still like to use JioCall to make Voice and Video calls, you will have to downgrade the firmware version for your device.

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