(NOKIA)
1. *3370# Activate Enhanced Full Rate Codec (EFR) - Your
phone uses the best sound quality but talk time is reduced my approx.
5%& nbsp;
2. #3370# Deactivate Enhanced Full Rate Codec (EFR) & nbsp.
3. *#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time & nbsp.
4. *#4720#Deactivate Half Rate Codec 
5. *#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rdLine : Compression Type & nbsp.
6. *#9999# Phones software version if *#0000# does not work& nbsp.
7. *#06# For checking the International Mobile Equipment Identity (IMEI Number) & nbsp.
8. #pw 1234567890 1# Provider Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
9. #pw 1234567890 2# Network Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
10. #pw 1234567890 3# Country Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
11. #pw 1234567890 4# SIM Card Lock Status. #pw 1234567890 3# Country Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
12. *#21# Allows you to check the number that "All Calls" are diverted to & nbsp.
13. *#2640# Displays security code in use.
14. *#30# Lets you see the private number.
15. *#43# Allows you to check the Call Waiting; status of your phone.
16. *#61# Allows you to check the number that On No Reply calls are diverted to.
17. *#62# Allows you to check the number that is Diverted in the mood " If Unreachable (no service)".
18. *#67# Allows you to check the number that "On Busy Calls" are diverted to.
19. *#67705646#Removes operator logo on 3310 & 3330.
20. *#73# Reset phone timers and game scores .
21. *#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  .
22. *#7760# Manufactures code.
23. *#7780# Restore factory settings & nbsp.
24. *#8110#Software version for the nokia 8110 .
25. *#92702689# Displays - 1.Serial Number, 2.Date Made, 3.Purchase Date, 4.Date of last repair (0000 for no repairs), 5.Transfer User Data. For some Model to exit this mode you need to switch your phone off then on again.
26. *#94870345123456789# Deactivate the PWM - Mem
27. **21*number# Turn on "All Calls" diverting to the phone number entered & nbsp.
28. **61*number# Turn on "No Reply" diverting to the phone number entered & nbsp.
29. **67*number# Turn on "On Busy" diverting to the phone number entered & nbsp.
30. 12345 This is the default security code.
2. #3370# Deactivate Enhanced Full Rate Codec (EFR) & nbsp.
3. *#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time & nbsp.
4. *#4720#Deactivate Half Rate Codec 
5. *#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rdLine : Compression Type & nbsp.
6. *#9999# Phones software version if *#0000# does not work& nbsp.
7. *#06# For checking the International Mobile Equipment Identity (IMEI Number) & nbsp.
8. #pw 1234567890 1# Provider Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
9. #pw 1234567890 2# Network Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
10. #pw 1234567890 3# Country Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
11. #pw 1234567890 4# SIM Card Lock Status. #pw 1234567890 3# Country Lock Status. (use the; * ; button to obtain the quot; p,w " symbols).
12. *#21# Allows you to check the number that "All Calls" are diverted to & nbsp.
13. *#2640# Displays security code in use.
14. *#30# Lets you see the private number.
15. *#43# Allows you to check the Call Waiting; status of your phone.
16. *#61# Allows you to check the number that On No Reply calls are diverted to.
17. *#62# Allows you to check the number that is Diverted in the mood " If Unreachable (no service)".
18. *#67# Allows you to check the number that "On Busy Calls" are diverted to.
19. *#67705646#Removes operator logo on 3310 & 3330.
20. *#73# Reset phone timers and game scores .
21. *#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  .
22. *#7760# Manufactures code.
23. *#7780# Restore factory settings & nbsp.
24. *#8110#Software version for the nokia 8110 .
25. *#92702689# Displays - 1.Serial Number, 2.Date Made, 3.Purchase Date, 4.Date of last repair (0000 for no repairs), 5.Transfer User Data. For some Model to exit this mode you need to switch your phone off then on again.
26. *#94870345123456789# Deactivate the PWM - Mem
27. **21*number# Turn on "All Calls" diverting to the phone number entered & nbsp.
28. **61*number# Turn on "No Reply" diverting to the phone number entered & nbsp.
29. **67*number# Turn on "On Busy" diverting to the phone number entered & nbsp.
30. 12345 This is the default security code.
