iPhone User Guide

iPhone works with MobileMe, Microsoft Exchange, and many of the most popular Internet-based email, contacts, and calendar service providers. If you don’t already have an email account, you can get a free account online at www.yahoo.com,
www.google.com, or www.aol.com. You can also try MobileMe, free for 60 days, at www.me.com.
You can add contacts using an LDAP or CardDAV account if your company or organization supports it. See “Adding Contacts” on page  213.