Please locate a number called IMEI on the modem. Open the place where the sim is inserted and you will see.
Visit this website http://huaweicodecalculator.com/new-algo/
Click on Login with Google .
Paste the IMEI and the model number in the box
A new unlock code will be generated
Put a different network sim in the modem. It will say this modem is locked. Please provide the unlock code.
Paste the unlock code in the box provided.