The only exceptions are (like those from China that replace the logic board). These come pre-unlocked, but they are not related to code calculators.
In theory, this code is entered into your Huawei phone via the emergency dialer ( *#*#3646633#*#* or similar codes) to permanently remove a carrier lock or bypass a screen lock.
Depending on your device type, different tools may be more effective: Device Compatibility Key Features Modems, Routers, and Phones
This comprehensive guide will explore everything you need to know about these tools, how they work, the algorithms behind them, and the safest ways to unlock your Huawei device without voiding your warranty or damaging your hardware.