For some older V4 devices, free offline calculators may exist. However, for V5 devices, they are rare and often require specialized software.
To illustrate real-world outcomes, here are summarized experiences from technician forums (GSMHosting, XDA): huawei v4 and v5 unlock code calculator by imei
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. For some older V4 devices, free offline calculators
A widely used professional tool that can auto-detect the device and determine if it's locked. 3. Enter the Unlock Code HUAWEI Unlock Codes - IMEI.info For some older V4 devices
When to seek professional help