BenQ-Siemens Secret Codes
Software version:

*#06#

to see more info, press softkey
again

English menu:

*#0001#

Deutsch menu:

*#0049#

Secret Code:

*#0606# remove sim card
before

Unlock Sim:

*#0003*(secret code)#

Bonus Screen:

*12022243121
Factory settings: Type *#9999# to
reset factory settings.(not tested).