Here am going to give you some tips to get the default password for bsnl modem.If it is changed by the user then this post won't help you.
All you want is the number of the land phone .I think finding it just simple
- And after getting the number we want to find the details of the user.To find this we can use the Online bsnl telephone directory.
http://dq.sdc.bsnl.co.in/bsnl-web/reversePhone.seam
- And after entering the number enter city name if u dont know the city name please find it using the 'STD CODE SEARCH' which is in the left side of the page
- From the result just take the first two letters of the name
- And prefix this with your landphone number
here TM2***1 - Now we got the first 8 letters of the password the remaing three will be code of the telephone exchange for me its vky because my exchange is in Vadakkancherry try to find your code it can be guessed