*3370# : This Nokia
code activates Enhanced Full Rate Codec (EFR) – Your Nokia cell 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# : With this Nokia code you can deactivate the Half Rate Codec
*#0000# : Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line :Compression Type
#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# : With this Nokia code you can deactivate the Half Rate Codec
*#0000# : Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line :Compression Type
