Before you can use any of iPhone’s features, you must activate iPhone by signing up for
a service plan with the iPhone service carrier in your area and registering iPhone with
the network. If you already have a wireless account with the carrier, you may be able to upgrade your account to work with iPhone, or keep using your old phone and add a
new line for iPhone. (Some accounts may not be upgradable.) You may also be able to
transfer your current phone number to iPhone, or get a new one
A single checkmark in “Set Up Your iPhone” syncs all these items automatically. Or you
can use iTunes to customize the information you sync, and to sync your ringtones,
music, photos, podcasts, and videos to iPhone. See the following section Download here