The IMEI is essential for calculating an unlock code. You can find it by:

If your modem software has a dialer, enter *#06# . Steps to Unlock Your ZTE Modem Online

To unlock your ZTE modem dongle, you typically need an 8 or 16-digit Network Control Key (NCK) generated from your device's unique 15-digit International Mobile Equipment Identity (IMEI) number. Newer ZTE models often require a , while older versions may only need 8 digits. How to Find Your ZTE Modem’s IMEI

Input the code provided by your chosen online calculator or service and confirm. Your device will now be permanently unlocked. Important Safety Tips ZTE Unlock Codes - IMEI.info