Try code from service provider.........
NCK code means Network Unlock code,You can get that from Online site,it's gather from Network Data base...You can get the Sony Ericsson NCK Code for K880I model Phone at here
Wickedunlock.com and Unlock it....You can enter the code using the instructions below:
Sony Ericsson K800i Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Sony Ericsson K800i mobile phones. If you enter over a certain amount of wrong unlock codes on your Sony Ericsson K800i mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson K800i without any SIM Card,
2 - Press the left arrow key/button once,
3 - Press the button * twice,
4 - Press the left arrow key/button once,
5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock)
6 - Enter the Unlock Code.
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