ZTE modem and dongle unlocking typically involves obtaining a Network Control Key (NCK)

have been popular for auto-detecting and unlocking ZTE data cards directly via USB. Critical Troubleshooting Tips USB Modem Quick Start Guide - ZTE Devices

: While the software is free to download, generating the 16-digit unlock code usually requires "credits" (paid). 3. Online Database Services

: Sites such as DirectUnlocks or sim-unlock.net process the device's IMEI to provide the specific 16-digit NCK (Network Control Key).

: For specific chipsets like the ZTE ZX297520V3 , there are open-source Python scripts available on GitHub that can generate unlock codes if you have the technical knowledge to run them. How to Use the 16-Digit Code

ZTE Modem/Dongle Unlock Code Calculator — 16‑Digit Unlock Codes (Guide & Template)

It sounds like you're looking for information about for ZTE USB modem dongles (often used for mobile broadband).