Tap ' Add Server', and enter one of the following DNS servers based on your own situation. Scroll down, tap ' Configure DNS' and choose ' Manual'. Tap the info icon next to the WiFi signal to go to the detailed page. And DNS setting is a manual process, so it would be difficult for non-technical users to operate. The Activation Lock will reappear after restarting. However, this method may not work every time, and can't unlock your device permanently since it is just a way trickier. It is finished by unlinking your iOS device from Apple’s servers and then connecting it to other third-party servers.
If your blocked device is running an old version operating system such as iOS 8 or earlier, you can try to bypass the Activation Lock without computer by changing the WiFi network’s DNS settings. Remove Find My iPhone Activation Lock Without Previous Owner Using DNS However, you won't be able to use a new Apple ID to sign in to iCloud, make phone calls, or access mobile data networks on the device.
