Samsung now leads the Smartphone industry. It’s also the biggest Android maker in terms of sales volume and popularity. In the meatime Samsung is manufacturing Windows Phone as well. These service codes below do not work on mobile platforms above-mentioned. They only apply to Samsung feature phones, possibly on its Symbian phone as well. So if these do not work on your phone, just ignore them.
*#06#, shows your IMEI code, applies to other brand phones as well.
*#9998*4357#, shows help information etc.
*#9998*5282#, shows information about Java menu (GRPS/CSD settings for JAVA server)
*#9999#0#, shows your phone’s Monitor Mode, but what’s that?
*#9999# or *#9998*9999#, shows your firmware version
*#8888# or *#9998*8888#, shows your hardware version
*#9998*746# or *#9998*0746# or *#0746#, shows information about your SIM card
*#9998*523# or *#9998*0523# or *#0523#, adjust your phone screen’s contrast
*#9998*842# or *#9998*0842# or *#0842#, turns on vibration (push OK to exit it)
*#9998*289# or *#9998*0289# or *#0289#, turns on buzzer (push OK to exit)
*#9998*288# or *#9998*0288# or *#0288#, shows information about battery & field
*#9998*377# or *#9998*0377#, prompt error log, regular users may not use it however.
*#9998*778# or *#9998*0778# or *#0778#, shows SIM service table:
*#9998*782#, shows date and alarm clock:
#8999*638#, shows network information: *
*#9998*5646#, changes operator logo at startup:
*#9998*76#, shows production number:
*#9998*968#, shows melody for alarm, you can change it in settings too
*#9998*585#, shows Non-Volatile Memory (NVM):
*#32436837#, turns on Digital Audio Interference
*#3243948#, turns Digital Audio Interference off