Study Focus
A silenced, face-down phone still measurably drains focus just by being nearby. Blocking the apps, not just the notifications, is what actually removes the pull.
Silencing your phone isn't the same as removing the pull. A well-known 2017 study out of UT Austin found that people performed significantly worse on focus-demanding tasks when their own phone was simply present in the room, even turned off and face-down, compared to when it was in another room entirely.
The mechanism is the effort of not thinking about it. As the study's author put it, "the process of requiring yourself not to think about something uses up some of your limited cognitive resources." Blocking the apps that pull at you removes that tax instead of just muting the trigger.
Another room beats a pocket, and a pocket beats the desk. The same research found a clear, linear trend: as a phone becomes more noticeable, in view, in a pocket, or on a nearby desk, available cognitive capacity drops accordingly.
Blocking and placement work together, not against each other. Keeping distracting apps blocked protects you if the phone has to be nearby, and putting the phone in another room removes even the passive cognitive cost blocking alone can't touch.
It's rarely "the phone" as a whole. It's usually a specific handful: social feeds like Instagram and TikTok, endless video like YouTube, games, and group chats that turn a two-minute reply into a twenty-minute conversation.
Blocking that specific list matters more than blocking everything. Apps you genuinely need for the work itself, like notes apps, calculators, or reference material, shouldn't be casualties of a broad block.
| Task type | Suggested session length | Why |
|---|---|---|
| New or difficult material | 25-30 minutes | Matches natural attention cycles before quality drops. |
| Review or repetition | 45-50 minutes | Lighter cognitive load tolerates a longer stretch. |
| Any session | Break after 2 hours max | Continuous work beyond this raises errors and lowers retention. |
1. List the apps that actually break your sessions. Be specific rather than blocking your whole phone.
2. Add them to a block list once. Blocked by default beats a new session every time you sit down.
3. Put the phone out of reach when you can. A different room, not just face-down on the desk.
4. Match your session to the task. Shorter for new material, longer for review, with a break every couple of hours.
5. Use one emergency unlock instead of ending the block. If something real comes up, a short unlock beats turning everything off for the rest of the session.
A Pomodoro timer protects the session. It doesn't protect the break. The five minutes between sessions is exactly when a "quick check" turns into losing the next session too.
Fella blocks the apps you choose all day, not just during a timer. That covers the study block and the break after it, with one 5-minute emergency unlock per session if something genuinely needs your attention.
The gap shows up directly in test scores. In one widely cited study, students who didn't use their phones during a lecture wrote down roughly 62 percent more information in their notes and scored about a letter and a half grade higher on a multiple-choice test than students who used their phones during the same class.
It's frequency, not one big distraction, that does the damage. Research on classroom phone use has found self-interruptions occurring roughly every three to four minutes during a single class or study session, each one breaking concentration and forcing a slower refocus than the interruption itself took.
The correlation holds at a broader scale too. Research from the American Psychological Association has linked a roughly 1 percent rise in classroom smartphone use to an average GPA drop of about 0.33 percent, consistent with the idea that it's the accumulation of small interruptions, not one dramatic session, that erodes performance.
Not as well. Research on smartphone presence found that a phone measurably reduces available cognitive capacity just by being visible or reachable, even when it's silenced, face-down, and turned off. Blocking removes the option itself instead of just the notification.
Ideally, in another room. Studies found participants with their phone in a different room performed measurably better on focus-demanding tasks than those with it in a pocket, bag, or on the desk nearby.
Roughly 25 to 30 minutes for demanding or unfamiliar material, matching natural attention cycles, and up to 45 to 50 minutes for lighter review tasks. Sessions much longer than that tend to increase errors and reduce retention.
The apps you actually reach for mid-session, most commonly social media apps like Instagram and TikTok, YouTube, games, and group chat or messaging apps that aren't essential to the work itself.
No, not if the apps stay blocked by default. A default block covers the in-between moments too, like a short break that quietly turns into 40 minutes of scrolling, without needing to be restarted each time.
With Fella, yes. one 5-minute emergency unlock per session covers a genuine need, like replying to a group project message, without ending the block for the rest of your study time.
Yes, though it works differently than a session timer. Instead of starting and stopping a block for each Pomodoro cycle, Fella keeps distracting apps blocked all day by default, which also protects the breaks between sessions.
One widely cited study found students who avoided phone use wrote about 62 percent more notes and scored roughly a letter and a half grade higher on a multiple-choice test. Higher classroom smartphone use has also been linked to lower GPA.
Fella blocks the apps that pull you away,
and gives you one 5-minute unlock per session.
