You cannot brute force a DCT4 phone. You need the exact code on the first try. This is where the calculator comes in.
Why don't we use these calculators today? nokia dct4 calculator
Over the years, several specific tools have become standards in the community: You cannot brute force a DCT4 phone
: To calculate a valid code, the user typically must provide the device's IMEI number (found by dialing *#06# ), the specific phone model , and the original network provider (including the Country and MCC/MNC codes). the specific phone model