A Soft-reset - the process of resetting all the settings of the phone to the factory default! No applications are deleted!
A Hard-reset is like formatting a drive! It does format the memory. Everything that has been installed after the first use of the phone is deleted! It will recover the memory of the phone to the state you purchased it! It is done by inputing the following code: *#7370#

NOTE: The battery must be full or the charger has to be connected to the phone so that it does not run out of power and make the phone unusable.

How to totally format your Nokia 3650 and remove all installed applications, user files and restore all
settings to default like it's new out of the box? (OEM apps won't be deleted like Camera and RealOne Player).

First Format your MMC: Menu > Extras > Memory > Options > Format mem. card > Yes.
Note: It is very important to format your MMC before you format your phone!
Then format your phone by typing *#7370# on main Phone screen.
Phone will ask: "Restore all original phone settings? Phone will restart." Press 'Yes' and enter your Lock code (default is 12345).
Tip: Formatting takes several minutes so you'd better connect your Nokia 3650
to a charger to ensure that your battery doesn't get empty in the middle of formatting.
Note: All your created acces points and mailboxes will be lost so take a note of them. And all application settings will be reset.
E.g. In Camera, image quality is set back to normal and memory in use is set back to phone memory. And also in Messages,
memory in use is set back to phone memory, etc. Also backup your contacts with PC Suite or a program like Contacts Manager.

To reset your wallet, should you forget your code,
Type in:
*#7370925538#
this will reset the wallet code, the wallet contents will be deleted.