Telecommunications help please

Unless I was hallucinating at the time, I seem to remember seeing a handy little gadget in a Tandy catalogue last year. You plugged it in to either your power point or your phone socket (I can’t recall which, but I think it was power point), and by plugging it’s “mate” into a power point elsewhere in the house you created another phone socket without the need to run wiring through or under the house.

We ostensibly have two phone lines in this house, but because our Telstra are total rat bastards, rather than physically running two lines from the pit at the front of our house, they have run a second line off the first by splitting them under the house. We have two separate phone NUMBERS (one for each line), but I believe from media reports that the manner in the splitting is carried out has implications when the lines are being used for dial-up ISP access.

We’re about to install a second PC, and as I neither want to pay huge amounts of money to have another telephone socket installed for the “A” phone line, nor get under the house and try to install one myself, I thought one of those little instant phone socket" gismos might be the answer. Intuitively, I suspect that the way our line has been split means the gismo won’t work in our case - is that correct?

Thanks for your help.