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Guess what even China Mobiles have Codes, like any other mobile like Nokia, SE, or Moto.  So be geaky with your China mob..
Default user code : 1122, 3344, 1234, 5678

Engineer mode : *#110*01#

Factory mode : *#987#

Enable COM port : *#110*01# | Device | Set UART | PS Config | UART1/115200

Restore factory settings : *#987*99#

LCD contrast : *#369#

Software version : *#800#

Software version : *#900#

Set default language : *#0000# Send

Set English language : *#0044# Send

Set English language (new firmware) : *#001# Send