If you like to restore only settings using Restore factory defaults in the mobile.
If yu like to format your phone follow below steps
If you know the security code you can use *#7370#it will full format,
Full format means it will delete all data in the mobile.
If you have forgotten security code you can follow the below steps
Press
green dial key, 3 and * at a same time when switching on the phone for
hard reset in case of forgotten security code.This will erase all the
contents in phone
Detailed explanation http://www.wikihow.com/Format-Nokia-N73
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