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.