The BrightBox will not accept any user name that doesn't end in "@fs". So it is only usable on Orange.
I retract my earlier statements that this router is general purpose not locked to Orange.
I am remiss in not trying it out 1st with an arbitrary username rather than assuming that cuz all the usual suspect fields were present and user-modifiable it would work anywhere.
Sorry for raising your hopes
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC