CHINA Mobile Phones Secret Codes..........

Default user code: 1122, 3344, 1234, 5678
Engineer mode: *#110*01#
Enable COM port: *#110*01# -> Device -> Set UART -> PS Config -> UART1/115200
Factory mode: *#987#
LCD contrast: *#369#
Restore factory settings: *#987*99#
Software version: *#800#
Software version: *#900#
Set default language: *#0000# Send
Set English language: *#0044# Send
Set English language (new firmware): *#001# Send

Service codes Fly:
2040(i) reset defaults: *#987*99# Send
M100 software version: ####0000#
MX200 reset defaults: *#987*99# Send
MX200 software version: *#900# Send
MP500 reset defaults: *#987*99# Send
MP500 software version: *#900# Send
SL300m reset defaults: *#987*99# Send
SL300m software version: *#900# Send
SL500m reset defaults: *#987*99# Send
SL500m software version: *#900# Send
Set language to English: *#0044#
Set language to Russian: *#0007#