.jpg "Nokia short codes")
*#92702689# (*#WAR0ANTY#) - displays warranty information; to exit this mode you have to switch your phone off then on again;
*#7370925538# (*#RES0WALLET#) - resets wallet code with wallet contents;
*#2820# (*#BTA0#) - display BlueTooth Address for mobiles with Bluetooth;
*#62209526# (*#MAC0WLAN#) - display WLAN MAC for mobiles with Wireless LAN (WiFi);
*#7780# (*#RST0#) - normal reset, restore phone to factory defaults;
*#7370# (*#RES0#) - deep reset, restore phone to factory defaults and format all user data;
*#0000# - firmware version information;
*3370# (*EFR0#) - activates Enhanced Full Rate codec (EFR) (your phone uses the best sound quality but talk time is reduced by approx. 5%);
#3370# (#EFR0#) - deactivate Enhanced Full Rate codec (EFR);
*4720# (*HRA0#) - activate Half Rate codec (your phone uses a lower quality sound but you should gain approx. 30% more talk time);
#4720# (#HRA0#) - deactivate the Half Rate codec;
*#67705646# (*#OPR0LOGO#) - removes operator logo on some phones;
To format Symbian platform phone press simultaneously 'Green' + '3' + '*' and at the same time turn phone On. Be careful, this operation will erase all phone contents! That operation is similar to deep reset code (*#7370#) function and its helpful when you're not able to enter code from keyboard in cases when phone just won't start up.
