Dear Willy, it work with your C75 too.. but you are so dumb you can not use a SEARCH in a forum...???
I refuse to descriibe again and again the same procedure... but people like you, "Sunday Unlockers" are still coming, and are more to come!
By my statistics, the average of "sunday unlockers" in SIEMENS section are 1/day, but in all forum it is about 14-15 per day!
Learn how to search something, or go to a professional unlocker! Dumb people like "sunday unlockers" will stil try to unlock the phones by himselves, and after that, will post threads with "Please HELP! My phone is dead" in the subject!
My advice: Forgot the siemens unlocking, forgot unlocking of phones at all, and go to professionals near you!