Advance secret codes for Nokia mobile

*3370# >> It activates Enhanced Full Rate Codec (EFR).

#3370# >> Deactivate Enhanced Full Rate Codec (EFR).

*#9999# >> check nokia phone software version if *#0000# does not work.

*#2640# >> Displays the current phone security code.

*#30# >> Lets you see the private number.

*#06# >> For checking the International Mobile Equipment Identity in short imei no.

press and hold # >> switch between lines 1 and 2.

*#7780# >> Restore factory settings