Modem + Switch what would happen, and what's point of 1 e-net port router?

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What would happen if you had say an adsl or cable modem connected to a say 4-port switch with say 2 PCs connected to the switch via ethernet cable.

I suppose both PCs would just get sent the signal simultaneously, they would both therefore be given the same public IP. Or would it just not work altogeher?

I supose your ISP would shut down your connection also as it would recognise you had two PCs running on one public IP.

I have just got hold of a 1-port BT router (voyager 220v router), well it also has 1 x RJ11 phone port and 2 x RJ11(voice phone ports?). I am hoping to use the router to test on someones adsl line whose wireless router is suspected of having packing in, this 1-port BT router was all i could source. I hope it works.

Just trying to work out the point of this one PC port router, i suppose your meant to add a switch to it if you want more PCs to run of the one WAN ip, why did the makers of this router not add more LAN e-ports to it?

Why would you ever buy this one e-net port router, is it becuase it supports multi phone RJ11 onnections as well as the main e-port PC connection?

I suppose if you are using IP phones then this is where the routing comes in, the routing will need to supply a private IP for 3 x RJ11 port and the 1x e-net port.

Pic of router.