"Watch out for TrapCall - Caller ID Blocking (*67) may not work for you!!!"
I called a local Spammer to tell him I didn't appreciate his trashing my neighborhood with his signs, when I finished talking, he read my phone number back to me. I was very surprised because I used *67 to block my cell number before calling him. I sure am glad that I remained professional and didn't harass or threaten him in any way.
Here is information I found on the web: In February 2009, the makers of SpoofCard released a revolutionary new service, called TrapCall. TrapCall is not a Caller ID spoofing service or product, but it's worth mentioning because it effectively makes Caller ID blocking (*67) completely useless now. TrapCall "unmasks blocked calls" so if a number is private, TrapCall can unmask, and reveal, the blocked number to the callee. A Caller ID unmasking service has never been offered commercially before and now many are saying that Caller ID privacy is dead.
#2. "RE: Watch out for TrapCall - Caller ID Blocking (*67) may not work for you!!!" In response to Reply # 1
Good advice - thanks to both of you for your posts.
Also be aware that anyone with an 800 number gets a list of people who call the number as part of their service. They can also get ANI (Automatic Number Identification), which acts like caller ID on 800 numbers.