Transform your voice when you buy a voice changer.  From novelty voice transformers like the one used in the movie Scream to professional voice changers, you'll be able to disguise your voice so that even your best friend can't tell it's you!  Electronic voice changers use digital voice changing technology to alter the pitch of your voice and make it unrecognizable. Phone voice changers vary in quality.  Obviously the inexpensive, novelty voice changers are great for telephone spoofing and playing April Fool's jokes on your friends and family but if you are serious about the quality of the voice output you'll invest in a professional version.