SCMxx is a console program that allows you to exchange certain types of data with mobile phones made by Siemens. Some of the data types that can be exchanged are logos, ring tones, vCalendars, phonebook entries, and short messages. Other actions like setting the time and dialling a number are also possible. SCMxx works with the following models: S25, S35i, M35i, C35i, SL4x, S45, ME45, C45, M50, MT50 and probably others. It basically uses the AT command set published by Siemens (with some other, additional resources).