My dad and his buddy devised a plan to get unlimited calls from phone booths to abroad. They drilled a 2 Deutschmark coin and put a fishing line through it. They figured out that the coin only drops after the allotted time is up, allowing the machine for there to be credit registered. But there was nothing preventing the coin from going upwards again. So they just kept pulling it out and then inserting the coin again. And re-dialing the international number. Like some petty comic book villains.

That would be because the notion of having a pay phone on every corner is.

That is beside the point. The phone is just a pathway, the hacking is the same. The phone gets the hacker to the end user. Today the cellphon/tablet/pc is just a pathway to the end user.

When it comes to tech as much as everyone thinks it changes the more it stays the same.