Some info in case u has a nokia... (Every code doesn't work in all nokia phones)
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 your instrument will show a 50% increase in battery. This reserve will get charged when u charge your 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).
CLICK HERE FOR MORE INFO
