Some new nokia tips & tricks and hidden secret codes for nokia phones

Today i am posting some new and some old secret codes for nokia phones.
Note: “Some of these codes are really dangerous so please try them if you know about them or if you can deal with them.”
Codes & Action
*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
Stay tuned if you want to know about more secret codes for nokia phones…