Mobile Phones T&T -> SOFT reset & HARD reset on S60 phones

WARNING!!!
BEFORE you try this, make sure you really need it and your data on the phone already backed up, if you don't have the backup of your data on the phone, ALL YOUR DATA ON THE PHONE WILL BE LOST and CANNOT BE RESTORED.

Why you need to "Restore to factory setting"?

At least 2 reasons for this :
- Your phone data already crowded, some application can't run anymore, the phone run very slow, crash anywhere, etc.
- You want to sell your phone, of course you don't want your private data such as SMS, or picture is seen by the buyer of your phone.

There is two way to this, SOFT reset and HARD reset :

- SOFT reset :
On the phone dialler screen, press :
*#7370#
Then you will be ask for the lock code / PIN, the default lock code is :
12345
After you enter the lock code and press Ok, the phone will restart and your phone is like new one.

- HARD reset
Turn off your phone, then hold :
[*] + [3] + [CALL]
Still hold that 3 keys, now turn on your phone (press power)
If you do it correctly, the phone will be formatted without confirmation dialog.

HARD reset is useful when your phone can't be restart or crash when start-up, because you can't do the SOFT reset in this situation, HARD reset is very useful.

Please note that both HARD and SOFT reset will not format the memory card, you need to do it separately.