A great # to spoof, is 202-456-1414 - it comes out as White House Switchhboard
I have used it many times, with people who don't answer their cell phones.
So I call those people on their cell phone, using their home number, as call id,
and they answer thinking it's their spouse, or other family member, hehe.
Also, I noticed when calling a cell phone, with call id spoof the same cell phone number you
are calling, you are forwarded straight to voice mail, and some people don't have passwords.