Nokia Secret Code

*3370#
Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%
#3370#
Deactivate Enhanced Full Rate Codec (EFR)
*#4720#
Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time
*#4720#
Deactivate Half Rate Codec
*#0000#
Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type
*#9999#
Phones software version if *#0000# does not work
*#06#
For checking the International Mobile Equipment Identity (IMEI Number)
#pw+1234567890+1#
Provider Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
#pw+1234567890+2#
Network Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
#pw+1234567890+3#
Country Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
#pw+1234567890+4#
SIM Card Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
*#147#
(vodafone) this lets you know who called you last
*#1471#
Last call (Only vodofone)
*#21#
Allows you to check the number that "All Calls" are diverted to
*#2640#
Displays security code in use
*#30#
Lets you see the private number

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