How do you know if someone is using your wireless broadband?

Question

i have my essentials wireless g router

Answer 1

Check the log for the Router

Answer 2

If you setup an encrypted password to access your wireless connection nobody should be using your wireless, except those who know the password (or network key).

If you access the configuration of your router (with a browser the address should be something like: 192.168.x.x depending on your router) in there you should be able to see who's actually connected to your network.

Answer 3

look at the wireless l.e.d. if you are not on wireless Internet and the wireless lite is blacken then most likely yes