Unlocking of ZTE K3806z and ZTE K3772z modems are supported by unlock code if it prompts for NCK code after changing the simcard. Once the modem is unlocked, you can use it with any network provider simcard around the world.
How to Unlock ZTE K3806z and ZTE K3772z Modems?
1. Change the default simcard with any another network provider simcard.
2. Connect to PC with USB cable.
3. Open the software of the modem.
4. It should prompt for simlock code.
5. Enter the unlock code, which is provided by modemsolution.com.
6. Now, your ZTE K3806z / ZTE K3772z is successfully unlocked to use with any network provider simcard around the world.