Blocking Mobile Internet Improves Mental Health and Attention
Key insights: 60-second read
- Blocking mobile internet improves mental health - A 2-week break led to improvements comparable to antidepressants and cognitive behavioural therapy.
- Attention improves significantly - The effect on sustained attention was similar to being 10 years younger.
- You don't need to be perfect - Even participants who didn't fully comply still experienced benefits. Reducing use is enough.
- Real-world activities are key - The benefits were driven by spending more time socialising in person, exercising, and being in nature.
- Most people benefit - Over 90% of participants improved in at least one area: mental health, well-being, or attention.
If you've ever felt like your smartphone is running your life, you are not alone. Half of all smartphone users - and more than 80% of those under 30 - worry they use their device too much. And the concern is valid. We know that excessive use may be linked to poorer well-being, mental health, and attention.
But until now, it's been hard to know if smartphones are causing these problems or if people who are already struggling tend to use their phones more. A new, rigorous study published in PNAS Nexus (Castelo et al., 2026) provides the most robust evidence yet that the causal link is real. The researchers conducted a month-long randomised controlled trial where participants were asked to block mobile internet on their phones for two weeks.
The results are significant. Blocking mobile internet for just two weeks led to measurable improvements in mental health, subjective well-being, and the ability to sustain attention. The effect on mental health was larger than the effect of antidepressants, and the improvement in attention was similar to being a decade younger.
"We found that blocking mobile internet for 2 weeks reduces smartphone use and improves subjective well-being, mental health, and sustained attention." - Castelo et al., 2026
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What the study found
The study, led by researchers at the University of British Columbia, recruited 467 participants. They were split into two groups. One group blocked all mobile internet access on their iPhones for two weeks. The other group acted as a control and did not block their internet until two weeks later. The researchers objectively tracked compliance using an app, a significant strength of the study.
Over 90% of participants who took part in the intervention improved in at least one of the key areas measured: mental health, subjective well-being, or sustained attention.
Mental health improvements
This was one of the most remarkable findings. The intervention led to a significant reduction in symptoms of depression, anxiety, and anger. The effect size was larger than the meta-analytic effect of antidepressants and similar to that of cognitive behavioural therapy.
This is not to suggest that blocking your mobile internet is a replacement for professional mental health treatment. However, it is compelling evidence that the constant connection to the online world may be taking a toll on our mental health.
Key point
The mental health benefits were not just a temporary shift. They persisted even after the intervention period ended, suggesting that taking a break can create lasting positive habits.
Attention improvements
In our "always-on" world, our attention is constantly fragmented. Notifications, emails, and the endless scroll demand our focus in short bursts. This study provides strong causal evidence that this has a real, measurable cost.
The improvement in sustained attention - the ability to focus on a task for a period of time - was objectively measured using a well-validated task. The magnitude of the improvement was about the same as the age-related decline in attention one would expect over 10 years. This means participants who took the break were, in terms of their attention, functionally 10 years younger than they were at the start of the study.
"The change in objectively measured sustained attention ability is about the same magnitude as 10 years of age-related decline."
Why blocking the internet works
The researchers explored several potential mechanisms to understand why taking a break from mobile internet is so beneficial. The findings were interesting. Blocking mobile internet freed up time that participants then spent on healthier, more fulfilling activities.
Specifically, the intervention led to:
- More time in the 'offline world': Participants spent more time socialising in person, exercising, spending time in nature, and pursuing hobbies.
- Less time consuming media: They spent less time watching YouTube, reading the news, or watching TV on any device.
- Increased social connectedness: Paradoxically, disconnecting from digital communication seemed to strengthen real-world social bonds.
- Improved self-control: Removing a constant source of distraction helped people feel more in control of their lives.
- Better sleep: Participants got slightly more sleep, which is a well-known contributor to both cognitive function and mental health.
These changes in how people spent their time and how they felt about themselves were responsible for the improvements in well-being and mental health. Interestingly, the effect on sustained attention was not explained by these factors, suggesting that reducing the constant distraction may have a more direct, cognitive benefit.
Practical tips for reducing phone use
You don't need to go cold turkey to see benefits. The study showed that even participants who didn't fully comply with the block - those who didn't have the app active for the full 14 days - still experienced significant improvements. The key is reducing your use.
Based on the research, here are some practical steps you can try:
1. Start with an audit. Use your phone's screen time feature to see where your time is going. You might be surprised.
2. Block or limit one app at a time. You don't have to block all internet. Try starting with social media. The study suggests even targeted blocks can help.
3. Create phone-free zones. Keep your phone out of the bedroom and off the dining table. This helps establish boundaries.
4. Try a 'digital sunset'. Put your phone away an hour before bed to improve your sleep.
5. Use app blockers. There are many apps available (like the Freedom app used in the study) that can help you enforce time limits or blocks on distracting apps and websites.
6. Be mindful of your triggers. Pay attention to when you reach for your phone. Are you bored? Anxious? Lonely? Find alternative activities for those moments, like going for a walk or calling a friend.
Frequently asked questions
Does this mean I need to get rid of my smartphone?
No. The study is clear that the constant access to the internet is what causes the problems, not the phone itself. The solution is to create intentional barriers between you and the endless stream of information, not to abandon the technology entirely.
Will a two-week break really make a difference?
The study's results suggest it absolutely can. However, even reducing your use can have a positive impact. The goal is to regain control, not to completely disconnect.
What if I can't block all mobile internet because I need it for work?
This is a common and valid concern. You don't need to block it entirely. Try creating specific times when you are 'offline' for personal use, and only use mobile internet for work purposes. Many phones allow you to schedule 'focus' or 'do not disturb' modes.
What about the feeling of 'fear of missing out' (FoMO)?
The study looked at this too. They found that people with higher levels of FoMO at the start of the study actually benefited more from the intervention. It seems that mobile internet exacerbates FoMO, and stepping away from it can be particularly liberating for those who experience it strongly.
We often think of our smartphones as tools that make our lives better. And in many ways, they are. But as this research shows, the constant connection to the online world may come at a cost.
The evidence is now clearer: stepping away from the mobile internet improves our mental health, our happiness, and our ability to think clearly. It allows us to reconnect with the world around us and, paradoxically, to feel more connected to others.
If you're feeling overwhelmed by your phone, you're not alone. And it's not a personal failing. It's a design feature of the technology. The good news is that we can reclaim our attention and our time by being more intentional about how we use it.
- Grant
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Disclaimer: This information is for educational purposes and does not replace individualised medical advice. If you have persistent pain or other concerning symptoms, consult a qualified healthcare professional. This blog post summarises a published research study; the original source should be consulted for full methodological details.
