When you sign in with your Apple ID, your contact information is automatically added when needed, and it's easier to look up details you have already provided.
An Apple ID is a user name you can use for everything you do with Apple. You can use the same Apple ID you use for iTunes Store, Apple Online Store, iChat, iCloud or other Apple services.
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Check Your Service and Support CoverageYour Service and Support Coverage
Review your Apple warranty status and eligibility for support and extended coverage.
