
Imagine your cell battery is very low, you are expecting an important call and you don't have a charger. Nokia instrument comes with a reserve battery. To activate, key is "*3370#"
Your cell will restart with this reserve and your 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
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