Sign in with your Apple ID
Your Apple ID is the account that you use to access all Apple services and make all of your devices work together seamlessly.
Use the same Apple ID every time and everywhere that you sign in. If you use Apple services like the iTunes & App Store, Apple Music, iCloud, iMessage, and FaceTime, then you already have an Apple ID and don't need to create a new one.
If you forgot your Apple ID, follow these steps to find your Apple ID again. You can also look up your Apple ID by entering the full name and email address associated with your Apple ID.*
*If your mobile phone number is your Apple ID, you might not be able to look up your Apple ID.
Sign in when you set up your new device
When you turn on and set up your new iPhone, iPad, iPod touch, or Mac, you’ll see a message to sign in with your Apple ID. After you sign in, all of the Apple services on your device will set up automatically.
If you want to change your sign-in preferences later—for example, use a different Apple ID for iCloud and iTunes—you can go to your device Settings or System Preferences.
If you already set up your device, it's easy to sign in from Settings on your iPhone, iPad, and iPod touch, or from each separate service on your Mac.