Reset the security lock on my iphone
How to reset the security lock on my phone
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Activation Lock is designed to prevent anyone else from using an Apple Watch if it's ever lost or stolen.
Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Activation Lock is an anti-theft feature that cannot be bypassed. Only the previous owner can remove the lock by using their Apple ID & password. Apple will not help you find the previous owner. If the previous owner cannot or will not remove the lock, then the iPhone is useless to you or anyone else. Try to get a refund (through eBay) or dispose of the iPhone properly.
If you are the ORIGINAL owner, then see the 'Start a support request' section in:
How to remove Activation Lock - Apple Support