[timberlandko]

Vonage oughtta do it for you. http://www.vonage.com/

[NicknamedBob]

"...building possibly a wireless home network..."

You'll want to use a router, not a switch ... wirelesss router if it seems feasible. As many connection points to your router as you have computers in the house.

And don't forget that some cellphone systems are on a pay as you go plan.