The O2 ADSL wireless router comes set up as default in quite a misleading way.

The "Admin" user is not the same as a "Superuser", as a matter of fact you have to log in as the following user to get full access to the box :

Username: SuperUser
Password: O2Br0ad64nd

This user can only log in from the LAN side of the box btw. and can log in using telnet. This will give you full access right to the box, and you can now turn on things like SNMP monitoring etc.

Btw. the users that come pre-configured are :