A symbian phone is just like a mini computer, it is powerful but easy to mess up or infected with virus if you did not manage it wisely. Formatting a symbian is very easy and can be done in just 1 minute. There are 2 kind of formation. By pressing the number below and wait for it to reboot.
1. *#7780#
Reset setting
It will reset your phone program / settings。but will keep the data (e.g. software, image ...)
It will just reset all your phone setting to default setting.
2. *#7370#
Reformat All
It will totally reformat all data in your phone memory C:
All data in your phone memory will be gone. [Drive C: will be formated]
The symbian OS will be reinstall and all setting return to default upon reboot.
However your memory card is not formated. [Drive E:]
To format your memory card, you can to go menu>tools>memory>option>Format mem.card
Personally i recommend you to backup everything important to your PC. After that start to format your memory card then only follow with *#7370# format.
Both 1 and 2 method will request for a password, the default password is 12345.

