If your device does not automatically prompt for a code when you insert a new SIM, follow these steps to access the hidden menu: ExpressUnlockshttps://expressunlocks.com Unlock ZTE MF971R - ExpressUnlocks
For users comfortable with PC software, tools like DC-Unlocker can often detect and unlock ZTE modems directly via USB. zte mf971r unlock
Connect your MF971R via USB and ensure all drivers are installed. If your device does not automatically prompt for