Imagine your cell battery is very low, you are expecting an important
call and you don’t have a charger. Problem? Problem?? Problem??? Problem?????
Nokia instrument comes with a reserve battery.
To activate, key is “*3370#”
Ur cell will restart with this reserve and ur
instrument will show a 50% increase in battery.This reserve will get charged when u charge ur
cell next time.
*3370# Activate Enhanced Full Rate Codec(EFR)-Your phone uses the best sound quality but talk time is
reduced by 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
