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Caller ID is easily spoofed and the telco's have no intention of fixing that.



These systems don't use Caller ID, I believe they use http://en.wikipedia.org/wiki/Automatic_number_identification which is more difficult (but not impossible) to spoof.

I had pretty good luck with http://www.trapcall.com/ when I had a phone stolen and the thief called me back. Didn't get the phone back, but the system worked as promised.

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