An Apple ID can be associated with up to 10 mobile devices and computers combined. Your Apple ID keeps track of purchases made through the iTunes Store, including music and apps and is helpful when moving from one computer to another. An iPhone or mobile device associated with your computer can be removed, or disassociated, through settings in iTunes.
It may be necessary to remove one or more of the associated devices or computers of your Apple ID if you would like to add a new device or computer and stay within the allotted 10 associations Apple provides. For example, if you upgrade to a new computer and will not be using an old one for managing your iPhone, you can remove the association through iTunes and transfer it to the new computer. This way, all your iTunes purchases are recognized on your iPhone with your new computer.
Sign into iTunes
Open iTunes on the computer you want to disassociate from your iPhone. Make sure you are signed in with your Apple ID by clicking "Store" then "Sign In" on the iTunes menu. From this menu, you can also see the purchases you have made through iTunes.
Manage Devices Through iTunes
After signing in, click "View My Apple ID" from the Store menu. This opens a screen showing your Account Information. From here, click "Manage Devices." A screen of information shows a listing of all your associated mobile devices and computers with your Apple ID. Click "Remove" next to any device or computer you would like to disassociate. For example, if you would like to remove your iPhone from your computer, navigate to the listing of your iPhone and press "Remove."
Associate iPhone With New Computer
Open iTunes on the computer you would like to add an association with your iPhone. Sign in with your Apple ID that you use on your iPhone to associate the computer with your iPhone, as long as you have not exceeded the allotted number of devices and computers.
Information in this article applies to iPhones and other mobile devices running iOS 6 or computers associated through iTunes 11 with an Apple ID. It may vary slightly or significantly with other versions or products.
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