Warning: Do not enter any wrong unlock unlock codes on your Sendo M580 mobile phones. If you enter over a certain amount of wrong unlock codes on your mobile phone, your phone may get hard locked and sometimes become unusable.1 - Switch on your Sendo M580 with a
NOT ACCEPTED SIM Card.
2 - When the message "Enter NCK" appears, Enter the Unlock Code.
NOT ACCEPTED : We mean, to use a sim card from a network other than the network your Sendo M580 is locked to.
Each Sendo M580 mobile phone has an unique unlock code. You can buy the unique unlock code for your Sendo M580 mobile phone at www.mobileunlocksolutions.com.