see what happens when you wire a home's electrical system with POTS copper wire, which was meant to handle voice pots, and maybe dsl if your close to the central office!
Imagine if you could fry the central office's DSL, POTS and other expensive line cards with some "box", what would you call it?
The TOILET BOX! Frying all the toiletries in the telco bellsouth central office!
Its all fused repeatedly. All you wud do is kill your phone line for a week. How stupid do u think they can be? $1000s of dollars of assests cud be distroyed in seconds by anyone with a screw driver, sure they wouldnt protect against that.