How to delete device from my apple id
How can I delete my daughters phone from my Apple ID?
iPhone 6, iOS 12
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You can't delete it. If you do, you will delete yours too. Create a new Apple ID for your daughter.
See How to create a new Apple ID https://support.apple.com/en-us/HT204316 See the data implications below.
Some of these things will apply to your situation even if you are not changing your Apple ID: What to do after you change your Apple ID or password https://support.apple.com/en-us/HT204071
Keep in mind that some things available under a first Apple ID will not be available under a new Apple ID. For example, you won’t be able to transfer anything purchased from the App and iTunes Stores to the new ID. And, there are other issues to be addressed. See
what Eric Root say on this matter here: https://discussions.apple.com/thread/251263630
what Winston Churchill says about it here: https://discussions.apple.com/thread/7452747
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You also set up family sharing between the IDs to share purchases made with the two Apple IDs. See:
Family Sharing https://support.apple.com/en-us/HT201060
Set up Family Sharing https://support.apple.com/en-us/HT201088