Nokia Battery Backup Trick

Imagine ur cell battery is very low, u r expecting an important call and u don't have a charger.

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% incerase 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