This video tutorial will teach you on how to add, change and delete contacts on your iPhone 3G. It will guide you on the two ways in accessing your contacts. It will also demonstrate the additional functions such as putting a company name, change the ring tone, add another phone number, add an email address, add a URL, add a photo and add to favorites.
Source:
http://www.youtube.com/watch?v=PRw82RDW3LI&feature=related