Maybe true in pre to early 1980s. With SS7, widely deployed in Europe and then the rest of the world, probing (tapping) was quite straight forward when the SP

Maybe true in pre to early 1980s. With SS7, widely deployed in Europe and then the rest of the world, probing (tapping) was quite straight forward when the SP complied with local lawful intercept regulations. http://en.wikipedia.org/wiki/SS7_probe http://en.wikipedia.org/wiki/SS7_probe