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here is a list of codes i have tested on My B7722:
*#0*# LCD Test - Screen, Audio, Cameras, Sensor Test
*#0011# InterRat Ncell 2G
*#0228# Battery Information
*#0283# Loopback Test
*#0289# Melody Test
*#03# Unique Number
*#06# IMEI 1 and 2
*#0673# MP3 Test
*#0782# Time and Date of the phone
*#0788# Picture Test
*#0842# Vibration Test
*#10371839# Shows Voice mail Number
*#1111# FTA S/W Version
*#1234# Firmware Version
*#197328640# Mater Menu (Settings)*#2222# Firmware update Revision number
*#232337# Bluetooth Adress (NAP, UAP, LAP)
*#24325786# Checksum
*#2470# BIP Enabled/Disabled
*#2652# CMLA
*#4777*8665# Power On Attach
*#4986*2650468# Firmware Version, Build Date, CSC Version, CSC Model
*#5239870*# Admin Setting (Software, Network & Application settings)
*#63895# Network Mode Selection*#698378# Test Mode ON/OFF*#7092463*# Internals Menu*#737381# Reset VOM & Camera Counters
*#746322# Multi Test Screen
*#7465625# Info about Security (network, SIM etc. Lock)
*#7790# Proximity Sensor Enabled/Disabled
*#78# Touch Screen Test
*#877# Touch Screen Calibration
*#877225# Touch Screen Calibration RESET
*#9999*0# Ncell 3G Info
*2767*2878# ! ! ! MASTER RESET ! ! !
*2767*3855# ! ! ! MASTER RESET ! ! !*2767*4387264636# Info about "Sell Out SMS", PC Code & TEST Mode
*2767*738767633# Sell Out SMS Disabled
*2767*73876766# Sell Out SMS Enabled
*2767*7387677763# Set to PRODUCTION Mode
*2767*7387678378# Set To TEST Mode LEGEND: for those in
BOLD most likely you will have to perform a MASTER RESET after this!!!
BEWARE: I have "MASTER RESETED" my phone about 4 times trying out these codes, so I would advise you to test only the INFO ones; or hit GOOGLE before, to learn what the specific code does (insert the code description into google);
the firmware of my phone is B7722XEJL1 ( It's possibile for firmwares later than DEC 2010 some of these codes to change)