Friends jiofi device is great and im using it for the last 3 months, I got it for rs 1999 from mini express store and its working great. using this you can turn your current 3g or 2g phone to experience 4g speeds and you can also install jio 4g voice to take advantage of free calling, speed is great and im getting speeds upto 5 mbps which ia great, it has a great battery life and hence is easy to stay connected when you travel, also jio dhana dhan offer is applicable to jiofi also so you can enjoy 3 months of free data and calling at rs 309.