I have to make some clarifications:
the problem happens when I boot the phone with mobile data disabled. In this case enabling data the icon turns on but isn’t shown the name of the carrier and connection doesn’t happen. To make it work (as I said) I have to restart ofono but with the icon already lit because if I enable data after restarting ofono it doesn’t work.
Today dbus error isn’t shown anymore.
I found an unsatisfatory but working workaround:
booting with mobile data already enabled (leaving it enabled on preceeding shutdown) connection happens on boot, I can safely disable and enable it again without problems and calls work correctly.
I’ll keep on testing and posting results here. My goal is to daily drive…