There is a quiet hierarchy in how people talk about reading. Hardback at a desk sits at the top. Paperback on a train is respectable. E-reader is acceptable, slightly technical. Phone is at the bottom, somewhere near "scrolling", and people apologise for it.
The hierarchy is about the object, not the activity. Nothing about a page of prose changes because the glass is smaller. If you read a novel on a phone, you read a novel.
The problem with phone reading is not the screen. It is that the screen is also where every interruption in your life arrives.
Where the guilt actually comes from
Two things get tangled together. One is screen time as a number, which treats forty minutes of a novel and forty minutes of short video as the same event because the same device logged them. That number was never designed to tell you anything about the quality of your attention, and taking it as a verdict on your reading is like judging a meal by the weight of the plate.
The other is interruption, and this one is real. A paper book cannot buzz. A phone can, and does, and every time it does you pay a small tax to get back into the sentence you were in. That is a genuine difference between the devices, and it is fixable in a way the first one is not.
So the honest version is not "phone reading is worse". It is: phone reading is the same reading, running on a device that is hostile to sustained attention by default. Change the default and most of the gap closes. The practical settings for that are in how to read on your phone without distractions.
What each device is genuinely better at
Phone. It is the only device that is always on you, which means it wins all the reading that would not otherwise happen — four minutes in a queue, a bus stop, the ten minutes before someone arrives. It is also the best device for serialised fiction, where you read a chapter at a time rather than settling in for an hour. It is the worst device for long unbroken sessions, because it is where your notifications live.
E-reader. Better for the long sitting: e-ink is restful, the battery is measured in weeks, and crucially the device does almost nothing else, so there is nothing to tab away to. It is poor at anything social or spontaneous, and you have to remember to carry it.
Paper. Best at memory of place — you remember roughly where in the physical book something happened, which helps when you want to find a passage again. Best at being lent, annotated and kept. Worst at dark rooms, small bags and buying things at midnight. The longer version of this comparison is in physical books versus ebooks.
Note that none of these are rankings of seriousness. They are different shapes of convenience.
The honest trade-off for a serial reader
If you read things published chapter by chapter, the phone is not a compromise, it is the native format. Chapters are short on purpose; they are built for the gaps in a day, and a device you have to go and fetch defeats the point. That is also why the comments, the arguments and the people live on phones — serialised reading has always been partly a conversation, as in novels published chapter by chapter.
The trade-off is attention, and it is worth stating plainly. On a phone you will almost certainly read in shorter stretches than you would on paper. Shorter stretches are not a moral failing, but they do suit some books much better than others. A plot-driven serial survives being read in twelve-minute pieces. A dense literary novel with long paragraphs often does not, and if you keep bouncing off one, the device may genuinely be part of it.
A middle position that works
Stop trying to pick a winner. Most people who read a lot run two or three devices without thinking about it: phone for the gaps and for anything serialised, e-reader or paper for the book they want to sink into, paper for the one they intend to keep.
And measure the right thing. Not screen time, not pages per day, not how virtuous the object looked. Whether you are in the middle of something you want to get back to. If you are, the reading is working, whatever it is running on. If you are not, no amount of switching to paper will fix it — that is a book problem or a reading slump, and it needs a different answer.
One disclosure, since this is a comparison and we have a stake in it: we make Arwy, an Android app for reading and writing books a chapter at a time and talking to other people reading them. So we are not neutral about phones. We are also the wrong choice for some of what is above — if what you want is a long uninterrupted evening with a six-hundred-page novel and nothing that can tap you on the shoulder, a dedicated e-reader or a paperback beats us, and there is no iPhone version of Arwy at all. Use whatever gets you back into the book.
Reading on your phone anyway? Read where other people are reading too. Arwy is on Google Play.