Updating a Contact’s picture ID on IPhone X
I changed the contact’s picture ID, why does it revert back to the old picture ID?? This reminds me of the birthdate issue.
iPhone X, iOS 16
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When you look deeply you will find that Contacts are neither stored on an iPhone nor on SIM. They are synced to an email account that you may have added and enabled Contacts. It could be Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other email client server.
When you enable Contacts in any of the email accounts they are displayed to you through the Contacts App. When you edit these contacts on an iPhone they are ultimately edited on the client-server.
Please see the pic below for a better understanding...