Reliance jio sim is superbb.iam using that sim from 1 month.The internet is very fast.It has free 4g internet upto 3 months and also free voice calls and free sms upto 3 months.i love this sim .Its 4g net speed is upto 15 to 20 Mbps.Download speed is upto10-15 Mbps and uploading speed is upto 20-25 Mbps. Surfing speed is very very fast .No 4g sim can exceed jio 4g speed .I use this sim mostly for internet and also for downloading hd quality movies.Among all sims this sim is the best one