update re MagicJack's modus operandi:
MagicJack dials wrong number in legal attack on Boing Boing "MagicJack's EULA says it will spy on you and force you into arbitration." This EULA, or End-User Licensing Agreement, concerns what subscribers must agree to in order to use the service. I wrote that MagicJack's allows it to target ads at users based on their calls, was not linked to from its homepage or at sign-up, and has its users waive the right to sue in court. I also wrote that that MagicJack's website contained a visitor counter that incremented automatically; and that the website claimed to be able to detect MagicJacks, reporting that "Your MagicJack is functioning properly" even when none are present."
http://www.boingboing.net/2010/02/23/magicjack-dials-wron.html