libGammu
The libGammu library exposes all Gammu functionality for various phones in standard API. It can be used to do anything with your phone, however for easier tasks you might prefer to use Python and python-gammu.
If you intend to use libGammu in your application, all you should need
is to #include <gammu.h> and then use Gammu functions. You can check
docs/examples/ for some small example applications. You don’t need real phone
for testing, use Dummy Driver instead.