I am using jio sim from 2 months ago.last month its downloading speed is aprox 40-50 kbps in uc browser.either it was giving 1mbps speed in youtube videos download.but now in these days it gives superb speed aprox 900 kbps to 1.1mbps in uc browser.i have downloaded more than 30 gb from my jio sim with superb speed.in these days its calling feature is also working properly.