You can do many things with cellphone codes, and here are a few of them. Not all of them will work on all models though, so don’t feel disheartened if that happens. The way to make these codes work is like this: punch them in blindly, and your phone will perform the function mentioned.
Nokia phones
*#06# IMEI (International Mobile Equipment Identity) information
*#0000# 1st Line: software version. 2nd line: date of software release. 3rd line: phone type
*#746025625# Checks if the SIM clock can be stopped. It is a kind of standby mode that will save battery. However, the
clock automatically gets activated when the phone is switched off and on
*#92702689# Here is a big one! A menu will come up with six choices. First, it’ll display the serial number. Second, the
month and year of manufacture. Third, the date of purchase. Fourth, the last repair date. Fifth, the option to transfer user data
if you have the hardware for it. Sixth, the number of hours the phone has been on. Some of these dates might not be displayed
if the information doesn’t exist
*3370# Enhanced Full Rate (EFR) codec activation
#3370# EFR codec deactivation
*4370# Half Rate codec activation
#4730# Half Rate codec deactivation
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EFR gives better voice quality compared to the half rate codec, but can cut down on the battery life. Your phone will automatically restart after you feed in any of the above codecs
xx# Here is a harmless little one. This will automatically display the number at the ‘xx’ position in your phone book
Motorola phones
*#06# Displays IMEI
<><><> 119 <> 1 <> OK Enable EFR
<><><> 119 <> 0 <> OK Disable EFR
Samsung SGH-2100/600
*#06# Displays IMEI
*#9999# Software version
*#0324# Technical menu
*#0523# Lets you adjust the screen contrast
*#0228# Battery status (capacity, voltage, temperature)
Anuj Jain