Nokia Mobile Formating Codes
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Series 60
On a Series 60 v1 based phone (N-Gage, 3650, 7650), two key sequences will allow to restore your phone to a cleaner state:
Normal Reset (*#7780#) : Restores ini files from rom but preserves user data (photos, 3rd party apps etc)
Deep Reset (*#7370#) : This reformats completely the C: drive. All applications and files stored on this drive will be lost and clean default files will be rewritten.
In both case, the phone will ask you a confirmation and you will have to enter a security code (12345 by default).
Files and applications stored on E: drive are not be affected by these sequences.
On newer Series 60 phones (6600/6620/7610 Etc), the sequence is slightly different: 
power the phone off, 
press and keep down the keeys green/talk + ’3’ + ’*’, - power on the phone. 
release the keys when the formatting starts.