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My son has been given a used iPhone but the previous owner has not signed out of iCloud and we cannot get in touch with them. Any ideas?
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You need to be able to contact the previous owner to have them log out of iCloud or go to https://www.icloud.com/find/ My Phone and erase the device, then remove it from their account. If you can’t do that, the device is useless. Apple won't unlock it.