Home Network :: How To Get More Ethernet Ports Available To Use / Without Losing Sky Router

I have Sky Fibre Optic Broadband, with a router supplied by Sky, (You can't use any other router, as username/password for internet is already put into router & they will not give you details when you phone them). The router they supply has only four Ethernet ports on. One is used by Sky to give you Fibre Broadband, thus leaving you with three.I have five devices that must use Ethernet, as they do not have wireless.How do I get more Ethernet ports available to use, without losing the Sky router, as Sky will NOT let you use any other router.