How to Change The Apple ID from an iPhone
I want to know how can I change my Apple ID from a work phone when I accidentally had another Apple ID installed on the phone.
iPhone 12
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If you want to change your ID, follow the steps in this article. Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
What to do after you change your Apple ID or password - Apple Support. *.