I read at least two novels a month (sometimes more if I get the time) on my tablet and my phone. Most of my reading is on my tablet, because it's a 7" and a damned good size to read on, but when I'm on the road, I'll use my phone. The app syncs between the two so I can swap between the two. I generally use the Kobo app, and by and large it hides the status bar at the top so I'm not bothered by incoming emails. I've never had a problem.
Actually, the very first book I read on a portable device was a crappy little LG Keybo feature phone that I installed a nice little J2ME reader on. The font size was punched up a bit so I usually only got a paragraph of text per screen, but still didn't have any problem.
I'll be honest, I haven't bought a physical book in over a year. Even the technical books; a Powershell book and the OpenVPN official manual, are all eBooks.