That said, reputable paid services and official carrier databases do generate 16-digit codes that work. But a free, downloadable, offline “calculator” is almost always too good to be true.
To unlock the device, you must generate a unique code based on your modem's (International Mobile Equipment Identity) . ZTE MF60 Personal Hotspot (MiFi) User Instructions To change any settings the default login password is admin. Conrad Electronic SIM Network Unlock PIN: Meaning & Fixes - iMobie Zte Mf60 Unlock Code Calculator 16 Digit