Caller ID spoofing was once the exclusive province of shady boiler rooms that could afford bulk-rate phone connections and expensive equipment. But in 2004, hackers found a way to spoof their Caller ID by taking advantage of permissive voice over internet protocol service providers that offer connections to the conventional phone network while allowing customers to send anything they want as their Caller ID. Entrepreneurs began marketing web-based spoofing to private investigators and pranksters shortly thereafter. Full Story