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,
vCards, phonebook entries, and SMS messages. It
works with the following phones: S25, C35i, M35i,
S35i, ME45, S45, SL45, M50, and probably some
others, too. It basically uses the AT command set
published by Siemens (with some other additional
resources).