Change apple-id on iPhone
I'm quitting work and want to change the apple-id based on my work-mail to my private one. How do I do that, still keeping my iPhone as is with regard to apps and all.
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When changing to the new ID, there may be some data loss, but you can minimize it. If syncing photos with iCloud, ensure Optimization is turned off in Settings/Your Name/iCloud/Photos and/or in Photos/Preferences/iCloud. Then make sure full resolution photos are on the device/computer. When signing out of iCloud, if asked whether you want to retain data, choose yes. Messages conversations will be lost if they are addressed to the ID. See the article below for other places that the old ID should be removed. See Winston Churchill's response in the below discussion. Also set up Family Sharing to keep access to your apps/purchases.
How to switch Apple IDs on your iPhone or iPad. https://www.imore.com/how-change-apple-id-your-iphone-or-ipad
How to transfer all files from one iCloud account to another. https://discussions.apple.com/thread/7452747
What to do after you change your Apple ID or password - Apple Support. https://support.apple.com/en-us/HT204071
Family Sharing. https://support.apple.com/en-us/HT201060
Family Sharing - Set up. https://support.apple.com/en-us/HT201088