Sadly KDE mobile phone stack hasn’t been accepted as google summer of code project (we had other 50 proposals with higher priority). Personally I don’t agree, so I plan to work on it anyway.
If you want to build a KDE mobile stack that is able to connect to GMS/UMTS/CDMA network you need to build ofono (or any other similar daemon) as first thing. You just need to download phonesim and ofono from here. Then you just have to build both with ./configure && make. If you want you can run both from source directory (but you’ll need to copy src/ofono.conf to /etc/dbus-1/system.d/ofono.conf).
Ofono configuration is rather simple, you just have to copy the following configuration in /usr/local/etc/ofono/phonesim.conf.
Now you are ready to run phonesim and ofono.
Our mobile phone stack depends also on ofono-qt library.
FSO is an alternative to oFono: freesmartphone.org