The Reliance JioFI comes with a free Jio4G SIM. However, you will need to go through the full documentation to get through the process of getting the SIM, without which this is just another Wi-Fi hub. The device has a 2300mAh battery. In the box, you have a charger and USB cable. The JioFi 2 switches on to create a Wi-Fi signal of its own. You can use the password printed on the device below where the battery goes in to log in to this network from any device and start browsing. Once you are logged in, open jiofi.local.html/ on your browser to log into the admin panel and change the password.
This is recommended for security reasons and also for the fact that you would otherwise be struggling to remember the password. If you are using the JioFI to store stuff using a micro-SD card, this is also managed using the same console.