Essen Electronics

  Code                        Description      *#*#0*#*#*     LCD display test     *#0001# :         Serial Number     *#0523# - *#8999*523#  : Display Contrast     *#06#  :             IMEI Number     *#0228# or *#8999*228#  : Battery Info     *#*#0283#*#*     Packet Loopback test     *#*#0588#*#*     Proximity sensor test     *#*#0673#*#* OR *#*#0289#*#*     Audio test     *#*#0842#*#*     Vibration and Backlight test    *#*#1111#*#*     FTA Software version    *#*#1234#*#*     PDA and Phone firmware info    *#*#1472365#*#*     For a qu...

These Nokia codes will work on most Nokia Mobile Phones *3370# Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%  #3370# Deactivate Enhanced Full Rate Codec (EFR) OR *3370# *#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. *#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). #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 "*...