I'm evaluating frameworks for phone, SMS and IM, and initially I started tinkering with D-Bus. then I found out about the telepathy framework. Then I found out about QtMobility.

From the general idea of things, I guess the safest bet for QT platforms is going to be QtMobility.
http://labs.trolltech.com/page/Projects/QtMobility
http://qt.nokia.com/products/appdev/...-apis/mobility