If you just trash PhoneView Demo.app, the entry in the Login Items tab is NOT removed. The Ecamm website indicates 'to uninstall PhoneView, simply drag the PhoneView icon to the Trash icon on your dock.' However, by default PhoneView will enable an option in its preferences to 'launch PhoneView when iPhone is Attached.' The effect of this option is to create an entry in the Login Items tab, which can be found in Accounts section of System Preferences.
The procedure outlined on Ecamm Network's website for uninstalling PhoneView is not necessarily complete.