CAUTION: Before you read further, please make a back up of your device and make sure you understand that you are doing this at your own risk.
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1. *#7780# – Soft Reset / Restore factory settings – resets all the settings to the default. Make sure you back up your data. The default code for ALL operations listed here is 12345.
2.*#7370# – Hard Reset - Reformat your phone memory (C: drive). Make sure you back up your data. The default code for ALL operations listed here is 12345.
When I perform Hard Reset I always uninstall all applications via Application manager first and then format the E: drive via "File Manager". This ensures that you see no remnants post Hard Reset.
I would also only advise restoring Contacts, Calendar, Messages and Bookmarks as in certain circumstances errors can be related to Settings or Files.
3. Hard reset for non-responsive phones – hold the following buttons * (star key), 3 (number button) and talk/green key for s60v3 based devices. Turn on the phone and do not release those buttons until you see the Nokia boot up screen. Once you feel the phone power up you can let go off only the power button while still holding all three buttons.
