I using reliance JioFi-3 for last 3 months. There are some pros and some cons with the app.
Pros- There are following good things with jiofy-3
Good internet speed
Connects easily with all the devices
easy to configure.
Connection is good when good network is there.
Cons- Apart from above mentioned pros there are some issues with jiofi-3
First of all the device size is comperatively lager than jiofi and jiofi-2. So it is difficult to carry it in pocket with your mobile.
The device got heating problem. The device get hot soon after using for 30 mins. And it become sifficult to keep such a hot device in pocket.
The device has to charge atleast tow times a day. If you use more than one device then it has to charge very frequently.
Although you can do free voice call using my jio app in mobile with which it connected but the connection during calling become discontinue sometimes.
Overall its a good device but not a good portable device. At a price of 2000 I expected a better device.