Put a SIM card from a non-supported network into the dongle and plug it into your computer. Trigger the Unlock Prompt:
Look at the sticker under the modem or beneath the battery cover. Zte Modem Dongle Unlock Code Calculator -16 Digit- Online
Connect the modem to your computer and check the "Diagnostic" or "Device Information" section in the connection manager. Put a SIM card from a non-supported network
If your modem software has a dialer, enter *#06# . Steps to Unlock Your ZTE Modem Online If your modem software has a dialer, enter *#06#
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.
Detailed instructions how to enter code in ZTE devices. ... OR: * without sim card compose: ###825*09# and enter the code from us, Check IMEI Info Unlock Your ZTE MF190 HSPA Modem | Expert Q&A on GSMLiberty