listed here are some of the advance nokia codes. Try it yourself!
*3370# / #3370#
Activate / Deactivate
Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%
*#4720# / *#4720#
Activate / Deactivate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time
*#7220# / *#7230# Enable / Disable PCCCPH
support (faster GPRS)
#pw+1234567890+1#
Provider Lock Status. (use the “*” button to obtain the “p,w ” and “+” symbols)
#pw+1234567890+2#
Network Lock Status. (use the “*” button to obtain the “p,w ” and “+” symbols)
#pw+1234567890+3#
Country Lock Status. (use the “*” button to obtain the “p,w ” and “+” symbols)
#pw+1234567890+4# SIM Card Lock Status. (use the “*” button to obtain the “p,w ” and “+” symbols) 12345 This is the default security code
*#0000# Displays your
phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression
Type
*#9999# Phones software version if *#0000# does not work *#06# For checking the International Mobile Equipment Identity (IMEI Number)
*#67705646# Removes
operator logo on 3310 & 3330
*#73# Reset phone timers and game scores
*#746025625# Displays
the SIM Clock status, if
your phone supports this power saving feature “SIM Clock Stop Allowed ”, it means you will get the best standby time possible press and hold # Lets you switch between lines
*#92702689# Displays -
1.Serial Number, 2.Date Made, 3.Purchase Date,
4.Date of last repair (0000 for no repairs),
5.Transfer User Data. To
exit this mode you need to switch your phone off then on again Hi
