Jio launched by reliance network. So first reliance having only 3g in bombay region how to they offer jio 4g is main queation . Second thing is that it only operated in latest andrid 4g mo . For that u need to registere and download joi app and internally apps of jio. By using barciad and document u can buy jio sim . After that feature in feature 4gb only in one day u can use after that ur speed is going to decrease. Main thing is hhat other network companies blocked the jio network so only u can call on jio sim or only jio customer can call u. After when u rember that u want to remove card and put other them main and most imp yhing u remember that ur mo will dead or blocj by reliance company . If u continue useing jio sim from 1 jan u have to pay minimum 5000 rs monthaly for only internet. Lets see 1gb deta is for 50rs. Sofor one day is 4gb 4x50= 200rs per day . So for 30 days it goes around 6000 rs . For gov rule u get discount of 1000rs so u compalsory to pay 5000rs monthaly . Otherwise ur mo gona dead. So west of money . Si dont buy jio its frody. Thx for reading my review