Look at the sticker under the modem or beneath the battery cover.
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 Zte Modem Dongle Unlock Code Calculator -16 Digit- Online
Open the modem's connection manager; it should automatically ask for the . Look at the sticker under the modem or
Connect the modem to your computer and check the "Diagnostic" or "Device Information" section in the connection manager. Zte Modem Dongle Unlock Code Calculator -16 Digit- 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.