The 16-digit code is more secure and algorithmically complex. It is generated using the device’s unique (International Mobile Equipment Identity).
If your dongle is asking for a , it is likely a corporate or MSL lock. Not all online calculators support this; you may need paid software like DC-Unlocker.
: While older ZTE modems typically used 8-digit codes, newer models (like the MF190 or Telstra T100) often require these more complex 16-digit codes generated via "New Algo" methods.
