|  |  |  | ModemManager Reference Manual |  | 
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        The D-Bus name org.freedesktop.ModemManager1
        on the system bus is the new name used by the ModemManager 1.0 daemon, and it
        implements several standard DBus interfaces, including the new
        
          org.freedesktop.DBus.ObjectManager
        
        interface, which allows to list available modem objects and get notifications
        where new ones are added or when existing ones are removed. There are therefore
        neither a custom method to enumerate devices as in the old 0.6 interface, nor
        custom signals to notify about added or removed modems.
      
        Modems which are found but are not usable will be flagged with a
        MM_MODEM_STATE_FAILED
        state in the
        
          State
        
        property, and a more detailed reason about the failure will be given in the
        
          StateFailedReason
        
        property. The most common case of failure is to have the SIM missing in a modem which
        requires one for operation.