how to find an owner of a locked iphone

If you have found a device, turn it on and see if there's a message. The owner may have done this:

Use the Find My app to locate a missing device or item - Use the Find My app to locate a missing device or item - Apple Support

"What happens if you activate Mark As Lost

...You can also display a custom message with your phone number on the Lock screen, and keep track of your device's location."

For some iPhones see the support article "Return a lost, locked iPhone"; click here --> Return a lost, locked iPhone - Apple Support

Otherwise turn it into authorities responsible for dealing with lost items.

If you purchased this phone from some and it is still locked to the owner, chances are they sold you a stolen phone.

Activation lock is a security protocol that can't be bypassed. Only the person it is locked to can unlock it.

If you bought this from someone and it came locked, try to get your money back, you will never be able to use the phone.

If your phone is Activation Locked - How to remove Activation Lock -

How to remove Activation Lock - Apple Support

The All Too Common SAD Reality of Buying a used phone -

The All Too Common SAD Reality of Buying … - Apple Community

No one can help you until the owner completes the following steps:

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

The phone is useless until these steps are completed, so you might be better off returning the phone for a refund.

If the beach has a Lost and Found that might be a good place to turn it in. If no such department, you should turn it in to the Police. I'm sure that by now you realize that there is no way for you or anyone else but the owner to use it.

[Edited by Moderator]

Hello i have bought an iPhone but the owner did not signed out of iCloud who can help me