It's locked to network or security code..
If it's under network lock you can get the Correct unlock code from the site
Superunlockcodes.com/nokia-x6/rs12wp9/ and get free Unlocking instructions at
Mobileunlockguide.com/nokia-x6 unlock it from network lock step by step.......Nokia has 5 Unlocking tries if those tries finished by entering wrong code you can't unlock it..It will get hard locked ,so you need to go to store and flash it....
Also Only GSM Network locked Phones can be unlocked ...CDMA Network locked phones cannot be unlocked...To Unlock from security lock try default codes like 1234 or 0000....
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