Thanks a lot!
I just needed to install bluez-utils, configure the files and restart bluetooth. bluetooth:/// in nautilus shows my mobile and the error message at boot is gone, too. COOL!
I'm just syncing my mobile with evolution via multiysnc :-)
Nevertheless I think, that bluez-utils is the wrong name for this package: Utils are usually optional, this one is absolut necessary.
So once again: Thank you very much
Christoph