According to SpoofCard.com there are various caller id apps for Android, Iphone, Windows mobile and more. With these apps it makes it easy to change your caller id to another number. All of these apps are free. If you are using Android, you can check out spoofcard in your android market.
Which device do you have?
On your iPhone go to…
iSpoofCard is now available as an iPhone web app! Just
go to iSpoofCard.com on your iPhone to install!
Google Android Phone
Available on your Android smartphone
To install apps from the web, enable “Unknown Sources” from the Android “Settings -> Applications” screen.
Available via BlackBerry Browser method
Enter the above address into your BlackBerry Browser to install SpoofCard for BlackBerry.
Available in the Palm App Catalog
Or on your Palm go to…
Enter the above address into your Palm Pre Browser to
install SpoofCard for Palm.
Windows Mobile Smartphone
Available via your phones browser
Enter the above address into your phones web browser to install SpoofCard for Windows Mobile.