Hacking Broadband

Is it possible to use my Broadband account by knowing the user ID and Pwd.

If yes tell me how.?

 

Can he/she use my account for logging in and do some unwanted things.

E.g--> for me the limit is (1 GB) say.
can he/she download in an unlimited way so that my bill will increase.

 

Can he/she use my account for logging in and do some unwanted things.

E.g--> for me the limit is (1 GB) say.
can he/she download in an unlimited way so that my bill will increase.

 

How is it possible when the IP address are dynamically allocated..!
Do explain...

 

If he/she know your password for your braodband, lets say iBurst, then that person can use any other iBurst router to connect to the internet using your account, he/she will be able to buy more bandwith, and even more, the same goes for adsl, all he/she needs is the username and password and know the ISP and the ISP's number and there you have it.