I am using jiofi device 1 month before its commercial launch. I was using reliance netconnect cdma based service before that but they stopped their service because of 4G upgrade taking place and then I got this option jiofi. It take about 4 days time to activate because there is no KYC process then. At starting I got the speed of 16 to 18 Mbps and that was great and as after commercial launch it goes down under 1 Mbps. Jio provide 6 months of free internet and free calling messaging. I connect my 3G phone with jiofi using jio 4G voice app and used it for calling at starting there was problem with calling its very difficult to connect to other operators but with the time problem sorted out. Battery backup is gud about 7-8 hours. Best thing is price which is very low.