How to Stop Doom-Scrolling on iPhone for Good
The same mechanism that makes porn blockers fail is why doom-scrolling fixes usually fail too, and the same fix works.
Why "just put the phone down" does not work
Doom-scrolling is not a decision you make once. It is dozens of tiny decisions a day, each one easy to lose, especially when you are tired, bored, or anxious, which are exactly the states that make willpower weakest.
Step 1: Identify your actual scroll apps
For most people it is 2-3 apps doing 80% of the damage. Check Settings → Screen Time → See All Activity to find yours instead of guessing.
Step 2: Set App Limits (the soft layer)
Screen Time → App Limits → add your worst offenders → set a daily time budget.
This helps with awareness but, on its own, has the same flaw every soft restriction has: the "Ignore Limit" button is one tap away.
Step 3: Remove the soft exit
Screen Time → Content & Privacy Restrictions → Account Changes → Don't Allow prevents some workarounds, but the bigger lever is your Screen Time passcode itself. If you can enter it to override a limit, the limit was always optional.
Step 4: Delete, do not just limit, your worst app
If one app is doing most of the damage, deleting it outright beats limiting it. You can always reinstall later if it turns out you actually needed it for something specific. Most people do not reinstall.
Step 5: Block reinstalling it during your reset period
iTunes & App Store Purchases → Installing Apps → Don't Allow. Otherwise "delete the app" lasts until the next bored moment.
Step 6: Lock the passcode itself
This is the step that makes Steps 2-5 actually hold. LockIn generates your Screen Time passcode, hides it, and locks it for a duration you choose, so the override option is not sitting there waiting for a weak moment.
What changes, realistically
Not focus and productivity overnight. Most people report the biggest early change is simply noticing the urge to check instead of acting on it automatically. The gap between impulse and action gets a little longer, which is most of what "breaking the habit" actually means in practice.