JIOfi is working wonderful because I use it.my father have 4g phone and they buy a jio sim card and use it.iam shocked when I see the speed of jio.i also want to buy this jio sim card . but I cannot because I have no 4g phone.and I not use jio sim.then I see the jiofi device on online store.and I purchased it.from home shop 18 online shopping site.after 8-9 days my parcel was arrived.then iam install it and insert jio sim.now I happy because I use jio network in 3g phone by connecting wifi.it has great speed.by this we all are use jiofi.but after some time jiofi speed will slow down