I used to love this app until one day it started saying "Some features unavailable," for no reason. Well, it was an old 4650 printer, so I bought a new 6400 series, which as noted, has no native interface and has to be controlled by app. Brand new printer also reports "some features unavailable," with no explanation, but scanning doesn't work on either device. Yeah, not acceptable. The "scan to phone" was the killer feature. I'm thinking about dumping both and buying Canon. Suck it HP.