Want wifi in your 3G or 2G device it is best option for you. Best wifi device, small in size, compact and easy to carry. Can connect multiple users, anybody can use it. You can also make calls, just neet to install jio4gvoice app in your mobile/tablet. No need to buy a 4G phone. Also SD card can be used in it. Can be connect to PC or laptop also. Good network speed. Some times network goes down due to weather problems. But other ways best device for net on 3G.