For a format (like what you want, deletes all applications, settings, etc.) type *#7370# in standby and enter your security code (which is likely 12345, unless your operator or you changed it).
For a reset to factory settings (keeps applications, deletes settings), type *#7780#.
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Verified answer
For a format (like what you want, deletes all applications, settings, etc.) type *#7370# in standby and enter your security code (which is likely 12345, unless your operator or you changed it).
For a reset to factory settings (keeps applications, deletes settings), type *#7780#.
tks