Spoofing Caller ID is the ability to cause a telephone or mobile network to display a different number on the receiver of the calls Caller ID display or smartphone that is not the real number. Spoofing is usually a term in which the call is done to cause harm. Most spoof calls are done as practical jokes so the caller can fake their caller id so they can disguise it. - Wikipedia
DISGUISING YOUR CALLER ID TO ANOTHER NUMBER?
In 2005 , there were a few websites that launched so customers could fake their caller id. These sites included PiPhone.com, CallNotes, SecretCalls, StayUnknown, SpoofTech, and SpoofCard.com. Spoofcard is still going strong and has the best services of all the caller id spoofing sites.
You can even try a free demo to spoof a call right now.SPOOFCARD – FREE star rating
IS CALLER ID SPOOFING AGAINST THE LAW?
On June 13th 2007 the U.S. Government passed the “Truth in Caller ID Act” which makes it”
“unlawful for any person within the United States, in connection with any telecommunications service or VOIP service, to cause any caller identification service to transmit misleading or inaccurate caller identification information with the intent to defraud or cause harm.”
Basically changing your caller id is legal as long as you don’t do it to defraud or cause harm.