*#*#273282*255*663282*#*#* OR *#*#273283*255*663282*#*#* - file copy screen (backup media files)
*#*#7780#*#* - Reset mobile phone to factory settings.
It'll remove following things: (Downloaded applications, Google account, all data and settings)
*2767*3855# - This code is used for factory format.
*#*#7594#*#* - Change the "End Call / Power" button action in your phone.
*#*#34971539#*#* - eStar MID 7138G Camera Information.
*#*#97#*#* - Language and Keyboard settings in eStar MID 7138G
*#872564# - USB logging control
*#301279# - HSDPA/HSUPA Control Menu
*#9900# - System dump mode eStar MID 7138G
*#*#46*#*# - Reset Sim in eStar MID 7138G
*#*#197328640#*#* - Enter service mode to run various tests and change settings
WLAN, GPS and Bluetooth Test Codes:
*#*#232339#*#* OR *#*#526#*#* OR *#*#528#*#* - WLAN test (Use "Menu" button to start various tests)
*#*#232338#*#* - Shows WiFi MAC address
*#*#1472365#*#* - GPS test
*#*#1575#*#* - For a more advanced GPS test
*#*#232331#*#* - Bluetooth Test Mode
*#*#232337#*# - Shows Bluetooth device address in eStar MID 7138G
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