I bought my bsnl 3g sim fro Kurukshetra ( Haryana ). Few days back I got my no. recharged with 750 rs n got 5 gb data usage. Jst now I checked carefully...While doing total data transfer ( down+up) of around 2 mb, 9 mb of data usage is deducted from my a/c.Is it due to roaming..??I am using sim in dongle at 0 balance, can it be a reason..??Reply asap guyz, as while registering at this forum and postin this thread , I'll lose approx 20 mb of my data..