How to block a call?

Question

does anyone know how to like block a call sortta. not so it says unknown name..but when u call it gives the phone a fake number..

Answer 1

I guess you're talking about callerID spoofing???

http://www.spoofcard.com/?gclid=CK7crJSX...

to block your number is *67 and then the number!

Answer 2

if in uk only option is to withhold your number, cannot sub another number.