PCA doesn't do this for each phone individually as that would be chaotic and simply unmanageable in a network with large number of endpoints. Instead you can setup a PhoneUnregThresholdExceeded per device pool and have it alert you when it hits those limits.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.