If you know that your phone has the following features, these codes here are for you:
==> 2 SIM CARD
==> TWO BATTERIES
==> TWO CHARGERS
==> TOUCHSCREEN ETC
China Mobile Secret Codes are here below;
*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#