Siemens S25 :

Siemens S25 :
Enhanced Full Rate
*#3370# turns on
#3370# turns off

Haft Rate Mode
*#4720# turns on
#4720# turns off.

Languages:

*#0000#+green phone - choose automaticaly
*#0001#+green phone - English
*#0030#+green phone - Greek
*#0031#+green phone - Netherlands
*#0032#+green phone - French
*#0034#+green phone - Spanish
*#0039#+green phone - Italian
*#0049#+green phone - German
*#0090#+green phone - Turkish

How to change PIN2?

**04*old PIN2*new PIN2*new PIN2#

What is my software version?

Menu 8-8-2 press left-softkey when you see IMEI number, or *#06# and then green phone button and then press left soft-key.

How to extend battery life:

IrDA - turn on only when you need.
Turn off automatic network search (6-3)Turn off Vibration alarm.

SP unlock *#0003*(secret code 8 digits)#

*#0606# shows you Secret Code, but only without SIM Card.

*#06# for checking the IMEI (International Mobile Equipment Identity)

Resets language to automatic selection : * # 0000 # then Green button