[MichaelGG]

This isn't true. You can get such numbers all over the world; some you can sign up for online and provide reasonably anonymity. You can make a lot money doing scammy-stuff and the risk of being prosecuted is pretty low. It's just not worth trying to go after some guy with an account with a telecom in Elbonia.

The cases of telecom fraud that I know of that were caught are usually due to incredible arrogance on the perpetrator's fault. In one case, he actually called the company he was attacking to gloat that they could never get him. (The company used a super-vulnerable-yet-expensive switch that literally had bugs like "&admin=1 gets superuser".) I've not seen a VoIP system that was remotely secure.