Codes are derived from your device's unique 15-digit IMEI.

Once you have generated your code, follow these steps to apply it:

Most ZTE modems allow only 5 to 10 attempts before permanently locking the device. How to Use a High-Quality Unlock Calculator

You cannot calculate a code without the IMEI. You can find this by: Checking the sticker under the modem cap or on the back.

Most legacy ZTE dongles used a simple 8-digit NCK (Network Control Key). However, newer 4G and 5G models utilize a . This shift was designed to prevent "brute force" attacks from simple offline generators.