Here under secret code to you be found How to overview your phone's imei no., firmware versions & How to mobile Reset factory settings & more.
Note: these codes should activate automatically after the last character input * (aka NO WARNING.
*#0*# - testing mode
*#06# - view IMEI number
*#0011# - service mode signal status
*#1234# - display phones current firmware
*#*#4636#*#* - battery and other general settings like GSM/CDMA
*#*#7594#*#* - change the "Power" button action in your phone.
*#*#7780#*#* - Factory data soft reset
*#*#8255#*#* - Gtalk service monitor
*#*#273283*255*663282*#*#* - Opens a File copy screen where you can backup your media files
*#*#1472365#*#* - GPS test
*#*#197328640#*#* - service mode main menu
*2767*3855# - Factory Hard Reset to ROM firmware default settings
*2767*2878# - leave Factory
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