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The Mastercode 2402447024 is correct for IMEI 356437014635597. This is the code needed to reset the Security code, nothing else, and it's for your phone only. You type in the security codes (any) until the phone request the Mastercode, when it does, leave your phone still, don't use it for 15 minutes, then type in the Master code. The default security code for Nokia is 12345.