Jio Fiber preview users can now sign up for the company's free landline service, JioFixedVoice, to make and receive phone calls via landline for free. In this video, we will tell you everything you should know.To use JioFixedVoice landline calling service you will need to first activate it via the MyJio app. You'll need to hook up your landline directly to the Jio Fiber wireless router once the service gets activated. You can also make free calls via a mobile app while you are connected to your Jio Fiber connection over Wi-Fi. Jio Fiber is set to launch commercially on September 4