On the main csreen type *#06# for checking the IMEI (international Mobile Equipment identity).
*#7780# rest to factory settings.
*#67705646# This will clear the LCD display (operator logo).
*#0000# To view software version.
*#32820# Bluetooth device address
*#764025625# Sim clock allowed status.
*#62209526# Display the MAC addressbof the WLAN adapter.
This is avilable only in the newer device that supports WLAN like N80
#pw+1234567890+1# Shows if sim have restrictions.
*#92702689# Takes you to a secret menu of the information below.
1. Display Serial Number.
2. Display the Month and Year of Manufacture.
3. DISPLAY (if there) the date where the phone was purchased (MMYY).
4. Display the date of the last repair - if found (0000).
5. Show life timer of phone (time passes since last start).
*#3370# - Enhanced Full Rate Codec (EFR) activation. Increase signal strength, better signal reception. It also help if you want to use GPRS and the service is not responding or too slow. Phone battery will drain faster though.
*#3370# - (EFR) deactivation. Phone will automatically restart. Increse battery life by 30% because phone recives less signal from network.
*#4720# - Half Rate Codec deactivation. The phone will automatically restart
If you forgot wallet code for Nokia S60 phone, use this code.
Note: your data in the wallet will be erased. Phone will ask you the lock code. Default lock code is: 12345.
Press *#3925538# to delete the contents and of wallet.
*#7328748263373738# resets security code.
Default security code is: 12345.
Unlock service provider: insert simm, turn phone on and press vol up (arrow keys) for 3 seconds, should say pin code. press C, then press * message should flash press * again and 04*pin*pin*pin#.
Change closed caller group (settings >security setting> usergroups) to 00000 and youre phone will sound the message tone when you are near a radar speed trap. Setting it to 500 will cause your phone 2 set off security alarms at shp exits, gr8 for paractical jokes! (works with some of the Nokia phones).