» (13) *#7760# 
Manufactures code. 

» (12) *#746025625#
Displays the SIM clock status, if your phone supports this power saving feature "SIM Clock Stop Allowed", it means you will get the best standby time possible. 
 
» (11) *#73# 
Resets phone timers and game scores. 
 
» (10) *#67705646# 
Removes operator logo on 3310 and 3330. 

» (9) *#30# 
Lets you see the private number. 

» (8) *#2640# 
Displays security code in use. 

» (7) *#06# 
For checking the International Mobile Equipment Identity (IMEI Number). 

» (6) *#9999# 
Phones software version if *#0000# does not work. 

» (5) *#0000# 
Displays your phones software version, First Line: Software version; Second Line: Software release date, Third Line: Compression type. 

» (3) *#4720# 
Activate Half Rate Codec - Your phone uses a lower quality sound, but you would gain approx 30 per cent more talk time. 

» (2) #3370# 
Deactivate Enhanced Full Rate Codec (EFR) OR *3370# 
 
»(1) *3370# 
Activates Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced by approx 5 per cent.