You can change the status of an existing Contact to FaceTime or Voice Call from within the Phone app. Open Phone, go to the Favorites tab, tap on the + (plus) button, and select a name from the Contacts list. A pop-up appears that will allow you to make the listing a FaceTime or Voice Call item.Note that you can do this with any contact listing, even those that do not have a phone number or a phone with FaceTime capabilities. Be sure to check about this before you try to add them. Also, if you're trying to FaceTime with an iPod touch user, you can only do this if they have a Wi-Fi connection to the Internet. In addition, you must have the e-mail address they use for their iTunes account. If you're trying to FaceTime with an iPhone 4 user, you have to have their phone number.
By Rich Hall
Updated 04/28/2011