Hi iam using Jio sim for last 2mnths and it’s network is good u will get almost everywhere it’s network.u will get unlimited voice and data till 31st December 2016 but u will get 4gb data daily with high-speed after that speed will drop to 128kbps.for using Jio u should have lte supported mobile and not only lte u also need volte.let me explain if u have only lte then you can use internet and u can also make call but using only Jio join app.and also for reciveing the calls u have to make your data on all the time.if u don’t make the data on den u can’t make or recieve calls.and if u have volte enable handset den u can always make and recieve calls without on the data.and if u call Jio to Jio call connects within a sec.but if u make calls to other networks call doesnt connect in one time.u have to try it for several times mostly it is happening when u call in any Vodafone or idea numbers.from 1st Jan 2017 u can recharge ur no. With minimum recharge of rs149 for 28days validity.and calls are free for lifetimes to any network u have to pay for only 4g data.