There is no 'master code'. The code is based on that phone's IMEI number. There are companies that will sell you the code for your phone. If your telco locked it, no one can open apart from them. They do that so stolen phones can't be used.
https://www.google.com/search?q=code+for+a+siemens+S45
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Testimonial: "OK Andrew, thanks a lot for your answer... I will try to call Benq (Siemens doesn't longer exist since Benq buy siemens many yeard ago)"
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