Unable to log out of someone else's Apple ID on iPhone

Apple can completely reset a device if a person can provide sufficient evidence of valid ownership. Read the requirements and steps for an Activation Lock support request at: https://al-support.apple.com/#/additional-support Apple says you need to have "proof of purchase documentation” and “proof of ownership documentation”, but does not detail what currently constitutes proof other than it “must include the product serial number, IMEI or MEID.” User reports on this community indicate that typically Apple will ONLY accept an original receipt issued by Apple or an Apple Authorized Reseller. Presumably this is the only kind Apple can authenticate against fraud since Apple is not involved in third party sales. Apple recommends that you "Keep your receipt after you buy an Apple device" --> Keep your receipt after you buy an Apple device - Apple Support

Note that the device cannot have Lost Mode set on it. If your device has been taken over by you having entered a scammer’s Account then the scammer may have set that too and the device is lost to you.

1. Never log into anyone else’s account.
2. 2. Having done that, you may be able to request activation lock removal at https://al-support.apple.com/#/. You’ll need to provide an original receipt from Apple or Apple authorized retailer.

YarikYarwo wrote:

I logged into someone else's Apple ID and couldn't log out of it, the owner demands money and threatens to block my phone, what should I do in this situation?

[Edited by Moderator]

Contact the police. You're hosed. There is no way to bypass this.

The scammer tricked you and now has control of your phone. What were you thinking? The only way to remove that is to prove to Apple (as has been detailed in the thread) that the phone is yours.

Sorry.