Hi my nane is rajeev.i am using jio sim. jio sim internet speed is less thanairtel speed.but still is a okayto some extent. if you have live sime then this is a very good think. and is the biggest advantages to the reliance from every competitor . as it provied free roming all over india. and its copetitor charges for that. in jio sim you just need to pay of the internet which is also at chapest rates for 4g. but main disadvantages is that a user with 4g LTE enabled smart phone came able to use the jio sim card , however he won, t be able to make any voice calls . that said relince has solution for that ask every user to download their jio 4g voice app for not interrupted voice call.