Why is my iPhone saying I can’t use Apple ID to login
Why is my phone saying I can’t use Apple ID to login
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Are you seeing an Activation Lock?
You need the Apple ID and password that was used when the device was first set up. If you don’t know that, you can’t remove the Activation Lock.
If this is a used device, the previous owner needs to go to https://www.icloud.com/find/ and erase the device, then remove it from their account. If they won't do that, the device is useless. Apple won't unlock it.
Turn off Activation Lock - Apple Support. *
If you are the original owner, contact Apple. Apple can remove the ID if provided the required paperwork to include the original purchase receipt with the serial number on it.