default user code: 1122, 3344, 1234, 5678

Engineer mode: *#110*01#

Factory mode: *#987#

Enable COM port: *#110*01#

Restore factory settings: *#987*99#

LCD contrast: *#369#

software version: *#800#

software version: *#900#

set default language: *#0000#

set English language: *#0044#

More some codes for reset mobile china

*#77218114#

*#881188#

*#94267357#

*#9426*357#

*#19912006#

*#118811#

*#3646633#