Remove the battery to find the sticker (IMEI is 15 digits) or simply insert a battery and dial *#06# to have the number displayed on the screen.
The DCT4 platform was a major step, but it wasn't the end. Nokia's security evolved through several key generations. Modern unlock methods are , so it's vital to know your phone's platform. nokia dct4 calculator online
You may have selected the wrong original network in the calculator. Remove the battery to find the sticker (IMEI
Which operator locked the phone (e.g., Vodafone, T-Mobile). How Does the Online Calculator Work? nokia dct4 calculator online