A free of cost network which you can buy or got free with LYF phones which is manufactured by Reliance company .Jio is also a reliance product. If you want to buy Jio sim card then take yours Adhar card(The candidate who wants to buy jio sim is must be above then 18+or use your dad and mom adhar card) or identity to the shop he will match it with yours fingerprint and give sim and take some money but nowdays it comes free of cost.Jio is giving 1 GB daily for free. But before 1 January jio is giving 4 GB with high speed data. If you used more than 1GB then data speed will low. And next day it will recover its speed .Jio prime after 31 March jio we have to pay for jio internet packs which we have to pay.