Some Nokia phones tricks

*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).


*#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.

#pw+1234567890+3# SIM Card Lock Status. (use the "*" butoon to obtain the "p,w" and"+" symbols).