DCT4 simply refers to the platform and technology (particularly security) used by a Nokia cellphone.

Besides the IMEI code, NokiaFree requires the model of Nokia cellphone too. NokiaFree is well coded to unlock most, if not all, of the Nokia cellphone up to DCT4 generation.

If your Nokia model is not explicitly shown in the list, you may need to select the correspondent Nokia cellphone generation code, that’s DCT1, DCT2, DCT3, or DCT4.

For example, Nokia 7600, Nokia 8800, Nokia 8910, are among of DCT4 generation.