Useful, but Secret, Nokia codes.

Disclaimer: This complete post, excluding the disclaimer, has shamelessly been lifted from Yahoo! Answers. The answer was posted by Pain Killer. I posted them (with a little changes) just in case any body needs them, they’d know where to fall back.

*3370# Activates Enhanced Full Rate Codec (EFR) – Your phone uses the best sound quality but talk time is reduced my approx. 5%
#3370# Deactivates Enhanced Full Rate Codec (EFR)
*#4720# Activates Half Rate Codec – Your phone uses a lower quality sound but you should gain approx 30% more Talk Time
*#4720# Deactivates Half Rate Codec

*#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type
*#9999# Displays phone’s 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
*#94870345123456789# Deactivate the PWM-Mem
press and hold # Lets you switch between lines

*#7760# Manufacturers code
*#7780# Restore factory settings
*#8110# Software version for the nokia 8110
*#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

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