I've got a flatmate that has probably contributed to using our BB data faster than normal. He does not pay for BB. So goin into my modem settings (NetComm wireless router), I first had to take note of the MAC address of my flatmates phone and laptop and his friends phone as well as my own under the >Wireless >Station Info settings and I would block their usage depending on the time of day using the >Advanced Set up >Parental Control >Time Restriction. He would video call and watch youtube at early ours of the morning.In addition I would block certain URL too using the >Advanced Setting >Parental Control >URL Filter setting.A point to note is that a full URL address is not required.  Even keywords instead of a URL will block SEVERAL sites instead of just the one.I would use keywords such as'download''torrent'It's just simple for me to delete the filter if I need to download a program, which is not very often at all.