Alcatel updated its security model frequently. A calculator that worked for a 2012 Alcatel OT-995 would work for a 2017 Alcatel 1C. There is no universal algorithm.
Most Alcatel phones allow only 3 attempts to enter the NCK code. After 3 wrong attempts, the phone will permanently reject all codes, including the correct one. The only fix then is a motherboard replacement or JTAG repair—costing more than the phone’s value. Alcatel Free Unlock Nck Code Calculator
If you have an older Alcatel phone and a real need to unlock it (e.g., you bought it second-hand or are traveling internationally), ignore the "free calculator" rabbit hole. Do this instead: Alcatel updated its security model frequently
The safest and most reliable way to get a free code is through your original service provider. Alcatel Free Unlock Nck Code Calculator