Thank you all its been great help...you know first I had contacted reliance customer care but they were quite vague ...in fact one of them even told me " you cannot check your netconnect usage , it comes in the bill and there you can see " , i kinda told him that is weird and unfair cuz then how would I know how much Mbs i've consumed so that i don't cross the 1 GB limit.
Anyway now i know how to check, thanks !!