To know the Usage of the broadband details visit http://10.240.43.216 . However, they not yet show the data transfer details and hopefully they will monitor it. However, u can use utilities like NetMeter or DU Meter to monitor ur data transfers. BSNL said that data transfer is unlimited till 30th June for those who subscribed before 31st March. Even for those who have subscribed after 31st March, it is reported that BSNL is not monitoring data transfer limits