Imagine your cell battery is very low and you are expecting an important call and you have a no chareger , so nokia instrument comes with a RESERVE BETTERY
To activate this tricks Follow some steps
First You press this key use this trick "*3370#"
your cell will restart with this reserve and your instrument will show a 50% incerase in battery.
This reserve will get charged when you 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%
now #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 Code.
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