Thankyou floppybootstomp and muckshifter for your replies.
I have just realised that the thing I`m talking about is a NETGEAR GENIE N150 wireless usb adapter,which plugs into my usb hub. The actual MODEM is in another room close to the main `phone.
But I don`t think that even the main router,which is also a NETGEAR,is secured.
Sorry to confuse the issue.
Many thanks for your replies.
Historian