libGammu

libGammu is core library of Gammu project. It provides abstraction layer to work with different cell phones from different vendors (including Nokia, Sony-Ericsson, Motorola, Samsung, Siemens, Huawei and others). Using this library you can talk to any phone using standard API.

The API exposes all functionality you can do with the phone and among others it provides following features:

Call listing, initiating and handling
SMS retrieval, backup and sending
MMS retrieval
Phonebook listing, export and import (also from standard formats such as vCard)
Calendar and tasks listing, export and import (also from standard formats such as vCalendar or iCalendar)
Retrieval of phone and network information
Access to phone file system (note that some phones work also as USB storage devices and those are not accessible through Gammu)

This library is used in all other tools like Gammu or Gammu SMS Daemon.