It has been done.
Let's see...what other options are there?
I dunno how much I remember from my adolescent phone phreaking days (what early-teenage boy back then
didn't mess around with hacking, phreaking, or small explosives building? War Games was the shit!)...that was about 13-15 years ago at this point, but there was one that we did back then that was pretty good.
(Caveat: there may be a step or two I'm not remembering, but I think this is right, and he has to live in a house for this not to be a lot more difficult...)
If you go to Radio Shack and get a wall-mount phone jack, two alligator clips, and a cheap phone, you can have tons of fun.
In the back of the phone jack, there should be seven wires, I think. Red, white, green, black, yellow....maybe it's five, I dunno. Regardless, connect the red and white wires to the alligator clips. These are what are known as the "ring" and "tip" of the line. Red is ring, white is tip.
In the back of somebody's private residence (usually in back - sometimes on side), you can find where the phone line runs into the house. There will be a small, sorta light bulb shaped junction covered by a gray rubber/plastic cover. At least, this is how I remember it looking back then.
If you remove that cover, there will be two screws. Guess what? These are for the ring and tip of the line. Right screw is for the ring, left is for tip. Remember - red, ring, right. It's an easy mnemonic.
Connect your alligator clips to the proper screws, plug your phone into the jack, and congratulations! If all went as I remember it going, you should have seized their phone line, and can now make calls on it.
Time to dial lots of incriminating 900 numbers, and then sneak off into the night like a ninja!
