How to access phone specific behaviour via dbus using the ofono API?

Looking after a reliable source for the ofono APIs, I finally got something in my hands that looks quite good ([nemomobile-packages/ofono](https://github.com/nemomobile-packages/ofono/tree/master/ofono/doc)). However even when trying seemingly obvious stuff like the following, I get an error stating that the method is unknown: dbus-send --print-reply --system --dest=org.ofono /ril_0 org.ofono.SimManager.GetProperties Am I doing something fundamentally wrong here? Admittedly, my Jolla currently hasn't a SIM card inserted, nevertheless I wouldn't expect an error message telling me that the *GetProperties* method is unknown. Interestingly, querying *GetProperties* of org.ofono.Modem works without any issues: dbus-send --print-reply --system --dest=org.ofono /ril_0 org.ofono.Modem.GetProperties My particular interest goes towards the *Powered* property of org.ofono.CellBroadcast, as it allows a good guess about the current connectivity. This one doesn't work for me either. Any hints welcome, maybe I just don't see the obvious.