The original owner can remove the device remotely via the Find My portal.
It handles both CDMA (MEID) and GSM versions of older iPhones. ipro-bypass-v3-0-5-meid-gsm-bypass-free-download-server-fix
iPhone XS, XR, 11, 12, 13, 14, 15, and 16 are not supported by checkm8-based bypasses because they use newer security chips. The original owner can remove the device remotely
If you have proof of purchase, Apple Support can remove the Activation Lock for free. ipro-bypass-v3-0-5-meid-gsm-bypass-free-download-server-fix