Recently I have purchased Reliance JioFi Device and it is very handy and light weight. You have to just insert the sim card into device and power on it. It will become an Hotspot device and now you can connect your phone via WiFi. Jio is providing a very good speed. Right now with recharge of 609 I am getting 2GB high speed data per day for 84 days. After that I have to recharge as per plan. You also can enjoy HD voice and video call through this device on your 3G phone with the help of Jio 4G voice app. Battery backup is around 6-7 hours. You can carry it in your pocket. It is a very useful device.