What You Need To use iPhone, you need: A new two-year wireless service plan with AT&T  A Mac or a PC with a USB 2.0 port and one of the following operating systems: Mac OS X version10.4.10 or later  Windows XP Home or Professional with Service Pack 2 or later  Windows Vista Home Premium, Business, Enterprise, or Ultimate edition  iTunes 7.3 or later, available at www.itunes.com  An iTunes Store account  An Internet connection You must be at least 18 years old to open a new AT&T wireless account. You will need a major credit card to open a new iTunes Store account. Activating iPhone Before you can use any of iPhone’s features, you must activate iPhone by signing up for an AT&T service plan and registering iPhone with the network. If you already have an AT&T (Cingular) wireless account, you can choose to upgrade your account to work with iPhone, or you can keep using your old phone and add a new line for iPhone. (Some accounts may not be upgradable.) You can transfer your current phone number to iPhone, or get a new one.