Some info in case u have a NOKIA Mobile...
1 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
2 *#0000# Displays your phones software version,
1st Line : Software Version,
2nd Line : Software Release Date,
3rd Line : Compression Type
3 *#9999# Phones software v ersion if *#0000# does not work
4 *#06# For checking the International Mobile Equipment
Identity
