This returns HTTP headers; replace -I with -L to follow redirects.
: If you bought a used device, the original owner can remove the lock remotely by signing into iCloud Find My and removing the device from their account. How to Protect Yourself Http- Unlockforme.tk
: If you are the original owner, you can request an Activation Lock support request from Apple with valid proof of purchase. This returns HTTP headers; replace -I with -L