Bro its actually slow speed considering you are on a 4G VoLTE network. Check my speed test result here: http://dreamdth.com/showthread.php?pid=1126720645#pid1126720645
Also check jio speed test result posted by another member: http://dreamdth.com/showthread.php?pid=1126704754#pid1126704754
But speed depends on many facts like spectrum the circle has, how much mhz band the operator uses. Private broadband operators also providing 10-20mbps speed these days at 1-1.5k.