I found it can see it thru the MyMaxis notification bar. Once u open ur MyMaxis app, notification will appear and u can see how many of the 300gb left there. I'm just sign up yesterday and upgraded from 30Mbps to 50Mbps. But speed only max at 40Mbps. Waiting for them to change the router and see the speed will improve or not. BTW, I can get 30 to 38 mbps for the 30Mbps plan.