i din know this in my first month of usage and saved 150mb for the nxt month only to know that they got wasted, from then on i ask the mtnl guys b4 i do anything that stupid 😛 .And btw the mtnl guys 90% of the time i've no idea wot i'm talkin bout and give unusual answers which are nowhere near my query. I'm yet to meet a cust care executive with an IQ more than that of a chimp, on mtnl's CC 😉