How to Unlock ZTE MF90 Router

First, you need the 16 digit unlock code by ZTE unlock code service provider like unlockninja.com
Once you get the unlock code the follow the process to unlock ZTE MF90 Router as below:
Make sure your ZTE MF90 router charged more than 30% if not, then you need to charge it.
Switch off ZTE MF90 WiFi/MiFi Router.
Now insert a non-acceptable Network SIM i.e. Change your default SIM card with any other network provider and switch on your device. You will show a message like SIM Locked or Invalid SIM or No network.
Now connect your Wi-Fi/MiFi MF90 router to Windows PC using its USB cable
Now Browse for 192.168.0.1 or 168.1.1 and login to your device using admin (It may be different for another device, refer the manual)
It will automatically redirect to the unlocking page, if not, then search for SIM Lock / NCK / unlock code option or leave it and follow below step
Go to Advanced Settings then go to SIM Settings. you will find the Unlock Device option there
Then Enter ZTE Unlock Code for MF90 and Click on Apply.
OR Open your Settings the Dial-up then Unlock SIM card and Enter 8 digits unlock code(i.e. NCK Code) in your ZTE MF90 Wi-Fi MiFi router.
Click OK then the device will reboot and your ZTE MF90 unlock permanently to display the new network

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