CallerIDFaker.com
I wonder how long that service will still be legal? After all, they are effectively facilitating fraud.
Maybe I'm naive, but I can't think of a valid legal reason for that service to be operating.
Most legit people might have reasons to withhold their number from Caller ID sometimes. Business have legit reasons to "spoof" their main contact number on all outgoing calls. But a service which allows anyone to spoof any number? That just doesn't sound like there could be a legitimate reason for using it.