Recently I found that you can check BSNL broadband usage through sms. For that you have to do following steps
STEP 1 : First register your Landline number by sending following sms 52295(+919448077777 for Non BSNL Users)
For example:Code:REG<space><STD Code><Landline Number> to 52295(+919448077777 for Non BSNL Users)
Code:REG 012272123456.
STEP 2
Now you can check usage, for checking Broadband usage send following sms to 52295(+919448077777 for Non BSNL Users)
Example :Code:BBU <space><STD Code><Landline Number>Code:BBU 012272123456.
Hope that is helpful to you!
Advert.