Does Having Your Phone Nearby Hurt Your Studying?

Having your phone nearby probably does hurt your studying a little, even when it's silent and you don't touch it. The best-known evidence is a 2017 study by Ward, Duke, Gneezy and Bos, which found students with their phone in another room scored higher on working memory and reasoning tests than students with their phone on the desk. Later research has been mixed, so treat it as a strong hint rather than a law, but since moving your phone costs nothing, putting it in another room is one of the easiest wins in studying.

This guide explains what the research actually found, what it doesn't show, and how to turn it into a simple setup at your desk.

What is the "brain drain" study?

In 2017, Adrian Ward, Kristen Duke, Ayelet Gneezy and Maarten Bos published a paper in the Journal of the Association for Consumer Research titled "Brain Drain: The Mere Presence of One's Own Smartphone Reduces Available Cognitive Capacity". It's one of the most cited pieces of research on phones and concentration, and it's worth understanding properly rather than as a headline.

How the experiments worked

Across two experiments, several hundred university students were randomly assigned to keep their phone in one of three places while they did a set of tests:

1. On the desk, face down.
2. In their pocket or bag, as they normally would.
3. In another room.

The phones were silenced so they couldn't ring or buzz. Nobody was using their phone during the tests.

The tests measured two things:

• Working memory capacity, using a task where you solve maths problems while remembering a sequence of letters. Working memory is the mental space you use to hold and juggle information, which is exactly what you use when following a proof or planning an essay.
• Fluid intelligence, using pattern-completion puzzles. This is your ability to reason through problems you haven't seen before.

What they found

The researchers also reported two interesting extra findings:

• Most participants didn't think their phone had affected them. If there is an effect, you probably won't notice it happening.
• The effect was larger for people who said they were more dependent on their phones. The students who relied on their phones most seemed to be affected most by having them close.

The second experiment also suggested that turning the phone off made little difference, as long as it stayed nearby. In other words, the issue seemed to be the phone's presence, not its notifications.

Why would a silent phone affect your brain?

The researchers' explanation is about limited attention. Your phone is one of the most personally relevant objects in your life. It holds your friends, your plans and an endless stream of things that might be interesting. The idea is that your brain keeps part of its attention on that object, even if only to stop yourself from checking it, and that leaves a bit less capacity for the work in front of you.

You can think of it like keeping one ear on a conversation across the room. You're not really listening, but you're not fully free either.

Other research pointing the same way

The brain drain paper wasn't the first to look at this idea:

• Thornton, Faires, Robbins and Rollins (2014), Social Psychology, found that the presence of a mobile phone was linked to worse performance on more demanding attention tasks, compared with a notebook in the same spot.
• Przybylski and Weinstein (2013), Journal of Social and Personal Relationships, found that having a phone visible during a conversation was associated with people rating the conversation and their partner less positively, especially when the topic was meaningful.

Neither is about studying directly, but both support the general idea that a phone in view isn't neutral.

Is the brain drain effect real? What the research can't tell you

It's important to be honest here. The brain drain study is interesting, but it isn't the final word.

1. Replications have been mixed. Other researchers have tried to repeat the experiment since 2017. Some found a smaller effect, and some found no clear effect at all. That's common in psychology, and it means the exact size of the effect, and whether it appears for everyone, is uncertain.
2. These were short lab tests. A 20 minute puzzle task in a lab is not the same as a three hour revision session at home. The effect might be bigger, smaller or different in real study.
3. It measured capacity, not grades. The study didn't follow students to see whether their marks changed.
4. It was university students. Results may differ for younger students, though there's no particular reason to expect phones to matter less for teenagers.

So the fair summary is: there's some evidence that a nearby phone takes up mental capacity, and the evidence is not settled.

Why you should move your phone anyway

Here's the thing. Even if the "mere presence" effect turns out to be tiny, there's a second, much less controversial reason to keep your phone away: a phone in reach gets picked up.

Phone checking is a habit triggered by cues, and nothing is a stronger cue than the phone itself sitting next to your textbook. Every check pulls your attention away from the work, and getting back into a hard problem takes time. Our guide on how to stop checking your phone while studying goes deep on breaking that loop.

So the decision looks like this:

When one option costs ten seconds and might help in two different ways, it's an easy call.

Where should you put your phone while studying?

From most to least effective:

1. In another room, ideally charging, so you're not tempted to bring it back "to check the battery".
2. Behind you and out of reach, inside a closed bag, drawer or box.
3. In the room but locked down, with distracting apps blocked for the session and notifications silenced.
4. In your pocket. Better than the desk, but you'll feel it and it's always one second away.
5. On the desk, face down. The weakest option. It's visible, reachable and still a cue.

Does face down count?

Not really. In the brain drain study, phones on the desk were already face down, and that group scored lowest. Face down hides the screen, but not the phone.

What about turning it off or silent mode?

Silent mode removes buzzes and sounds, which is worth doing. Turning the phone off adds a small hurdle before you can use it. Neither removes the phone from your view or your reach, and in the 2017 study the phones were already silent. Use them as extras, not substitutes for distance.

What about a smartwatch?

There's not much research on watches, but the same logic applies: a watch that lights up with messages is a notification on your wrist. Turn on a Focus mode that covers the watch too, or switch watch notifications off for study time.

"But I need my phone in the room"

Plenty of students do: for a timer, an authenticator code, flashcards or a parent who needs to reach them. Here are some workarounds.

If the phone truly has to stay nearby, block your distracting apps for the session so the phone becomes a tool, not a slot machine. Our step-by-step guide to blocking apps on iPhone while studying covers every built-in option and its limits.

Try a one-week phone distance experiment

Research tells you about averages. You care about you. Run a simple experiment over a week of normal study:

1. Pick a task you repeat, such as practice questions, flashcards or pages of reading.
2. On days 1, 3 and 5, study with your phone on the desk (silent).
3. On days 2, 4 and 6, study with your phone in another room.
4. After each session, write down how much you got through and rate your focus from 1 to 5.
5. On day 7, compare.

Here's a template:

It's not a scientific study, but it gives you real information about your own habits. Many people are surprised by the "times I reached for it" column alone.

What about heavy phone users?

The 2017 study reported that people who described themselves as more dependent on their phones seemed more affected by having them close. If you feel uneasy without your phone, or you check it dozens of times an hour, distance may matter even more for you.

Start small. One 20 minute block with the phone in another room is a real win. Build from there.

If your phone use feels out of your control, or it's affecting your sleep, mood or relationships, it's worth having a chat with a GP, your school counsellor or a service like Headspace. That's a normal thing to ask for help with.

Does this matter in class, the library and exams?

The same idea applies anywhere you need to think hard.

• In class. If your school allows phones, keep yours in your bag rather than on the desk. Better still, use a locker if you have one. A phone on the desk during a lesson is a constant invitation, even if you never touch it.
• In the library. Libraries are great for focus, but a phone on the table undoes a lot of that. Leave it zipped in your bag under the table, or hand it to a friend who's studying with you and agree to swap back at the break.
• In exams. Your phone won't be in the exam room anyway, which is a good reason to practise without it. If you always revise with your phone beside you, sitting a paper without it can feel unfamiliar. Doing timed practice papers phone-free makes the real exam feel normal.
• At home with family around. Pick a "phone parking spot" in a shared space, such as the kitchen bench. It's easier to stick to when everyone knows where your phone lives during study time.

How to put this into practice

A simple study setup that applies all of this:

• Before you sit down: decide your task, start a Focus mode, put the phone on charge in another room.
• During the session: work in timed blocks, ideally 25 to 50 minutes, and use active study methods that keep your brain busy, such as practice questions or active recall.
• In breaks: stand up and move. Leave the phone where it is until a planned check-in.
• After the session: check your phone guilt-free.

For the rest of the routine, from energy to breaks to environment, see our complete guide on how to focus while studying.

When your phone has to stay in the room: StudyDork

StudyDork is a free iPhone app for studying with friends, built for the situation where the phone can't leave the room, for example because it's running your study timer. Before a session, you choose the apps to block, such as Instagram, TikTok or YouTube, in Apple's own app picker. During the session those apps are locked until the timer ends, even if StudyDork is closed, so the phone on your desk is a timer rather than a feed. You can read how the StudyDork app blocker works.

It also adds a reason to leave the phone alone. In a study clan, your clanmates see you studying at a desk in your shared room while you focus, and you see them. Studying alongside people is a classic accountability trick, and you can find out more on the study with friends page, or in our guide to finding a study accountability partner.

Out of sight, out of reach, out of mind

The science on whether a silent phone drains your brain is still being argued about. The practical answer isn't. A phone in reach gets checked, and a phone in another room doesn't.

Next time you sit down to study, take ten seconds and walk your phone to another room. It's the cheapest focus upgrade you'll ever make.