Warning: Do not enter any wrong unlock unlock codes on your Sanyo C403ST 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 Sanyo C403ST with a
NOT ACCEPTED SIM Card.
2 - Enter the Unlock Code and press OK.
3 - Your phone is now unlocked.
NOT ACCEPTED : We mean, to use a sim card from a network other than the network your Sanyo C403ST is locked to.
Each Sanyo C403ST mobile phone has an unique unlock code. You can buy the unique unlock code for your Sanyo C403ST mobile phone at www.mobileunlocksolutions.com.