Mobile Number Spoofing

Hi friends,
Is anyone heard about Mobile number spoofing?
Mobile number spoofing means faking someone's mobile number to make call to someone. More clearly I can call you from your Dad's phone number, or can call you from a number of film stars. Think about it, howz that??

But someone with very bad intentions can use this technology for very very bad things.
I tested it successfully. But i can't describe that here bacause of security reasons.
If u have any doubts just put a comment on me!!