Hacker News new | comments | show | ask | jobs | submit login

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.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | DMCA | Apply to YC | Contact