How delete all contacts?
How delete all contacts from IPhone 13
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Unlike some Android devices, contacts are neither stored locally on an iPhone nor in SIM. They are synced to an email account that you had Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other
Remove the email account that stores your contacts in the IOS mail app or disable Contacts. If you have a corporate email account added through a profile on your device, please check with your organisation's system administrator.