Connect the modem to your computer and check the "Diagnostic" or "Device Information" section in the connection manager.
Use reputable services like IMEI.info or sim-unlock.net to request a code based on your IMEI. Zte Modem Dongle Unlock Code Calculator -16 Digit- Online
Put a SIM card from a non-supported network into the dongle and plug it into your computer. Trigger the Unlock Prompt: Connect the modem to your computer and check
Look at the sticker under the modem or beneath the battery cover. Trigger the Unlock Prompt: Look at the sticker
Open the modem's connection manager; it should automatically ask for the .
If your modem software has a dialer, enter *#06# . Steps to Unlock Your ZTE Modem Online
If no prompt appears, access the web interface by typing 192.168.0.1 or 192.168.1.1 into your browser. Log in with the default credentials (usually admin for both) and look for or NCK settings.