Software Version This code shows you software version, date of manufacture and hardware model number of your phone.

* # 0000 #
Show IMEI code If you need to know what's the IMEI code of your phone, simply press:

* # 06 #

you'll read it on display.
Show Service Menu To get additional information from your phone you can use the so called "warranty code", try typing:

*#92702689#    (= *#war0anty#).

Now you are in service menu where you'll find:

1 IMEI (International Mobile Equipment Identification)
2 Made MM/YY (date of production of the phone mm/yy)
3 Purchasing Date (here you can enter the date of purchase. If you enter an incorrect date, you cannot correct it later !
4 Repaired (date of repair, if there was one)
5 Transfer user data?
Enhanched Full rate codec *3370# EFR will be activated after a reboot of the phone ( consumes more power )

#3370# EFR will be switched off after a reboot of the phone.

Half rate codec *4720# Half Rate coded will be activated after a reboot of the phone ( better standby time )

#4720# Half Rate coded will be de-activated after a reboot of the phone

Profiles Menu If you press the "Power on" button for a short moment, the menu with the profiles is shown on the display. If you press one more time, the mobile turns itself off. You can use the up and down cursor keys to scroll and enable a different alert setting.
Unlock SP lock Here is a way to Unlock your phone which is Service Provider locked, without to know SPLock code !!!!
Give it a try:

First of all, PIN CODE MUST BE ON, then press:

C
<arrow down>
C and hold until it clears display
* and hold until start to blink
* and hold until start to blink
04*<your pin>*<your pin>*your pin>#

Each time you turn your phone OFF it resets the lock, so this need to be done each time you'll turn your phone ON :-(
Anyway it's better than nothing, isn't it?