Open your DCT4 calculator tool. Input the IMEI. Select the Provider ID (or enter the MCID). Click "Calculate" or "Generate."
You need the Provider ID. This can be found by:
: Users could buy a cheap, locked phone and unlock it for free, avoiding high roaming fees or expensive "unlocked" retail prices.
A is an algorithm-based program that generates master unlock codes (specifically restriction codes or "master codes") for a specific generation of Nokia devices.