A program that can secretly change your dialup connection setting so that instead of calling your local internet provider, your PC calls are routed to an expensive 0900 or international phone number.
ToneLoc is a dual purpose wardialer.
It can look for either dialtones or modem carriers. It is useful for finding PBX's, Loops, LD carriers, and other modems. It works well with the USRobotics series of modems, and most hayes-compatible modems.
The exe file can be executed from the command prompt.
From the Website:
Wardialer / Scanner for the PC | A small yet powerful DOS based phone exchange scanning/dialing utility.