Hidden Secret Service Codes for Chinese Mobile Phones

As we all know Chinese mobiles are getting BIG market in India and other countries. Here I'm sharing a few secret service codes for these Chinese mobiles. None of them was tested by me but all codes should work because these codes have been taken from a respected mobile manufacturer company:

Enter into Engineering Mode: *#110*01#

Enter into factory Mode: *#987#

Restore Factory Settings: *#987*99#

Check Software Version: *#900# OR *#800#

Default User Codes: 1122, 3344, 1234, 5678

Change LCD Contrast: *#369#

To Enable COM Port: *#110*01# -> Device -> Set UART -> PS Config -> UART1/115200

Codes to Change Screen Language:

Set Default Language:*#0000# + Send 

Set Language to Russian:*#0007# + Send

Set Language to French:*#0033# + Send

Set Language to Spanish:*#0034# + Send 

Set Language to Italian:*#0039# + Send

Set Language to English:*#0044# + Send 

Set Language to German:*#0049# + Send

Set Language to Thai:*#0066# + Send

Set Language to Vietnamese:*#0084# + Send

Set Language to Arabic.:*#0966# + Send