If a device that you rent from the Installer is blocked or unblocked by the Installer, you will receive a notification about that.
If a rent device is blocked by the Installer, you are not allowed to operate the device via the Mobile Client. In this case, you can contact the Installer and ask her/him to unblock the device if required.
For such a notification, you can view the Installer who block/unblock the device and the site where the device is added.