a note for myself ;)
1. *#7780# - Restore factory settings - resets all the settings to the default ( you will not lose any data)
Make sure you back up your data as you will lose all of it when you perform option 2 or 3 on this list. The default code for all operations listed here is 12345
2. *#7370# - Reformat your phone
source
Keywords: express music, hard reset, nokia 5800, nokia