How to Lock Screen Time So You Can't Change It (The Right Way)
Setting up Screen Time is easy. Locking it so future-you can't undo it is the hard part. Here is the complete guide.
How to Lock Screen Time So You Can't Change It (The Right Way)
The difference between setting up Screen Time and actually locking it
Screen Time is one of the most underused tools on iPhone, and also one of the most misunderstood. Most people who set it up have it disabled within a week — not because the setup was wrong, and not because they lacked discipline in some general sense, but because they could undo it whenever they wanted, and wanting to eventually shows up for nearly everyone.
Locking Screen Time so you genuinely cannot change it requires three specific things, done in this order, none of which are optional if you actually want it to hold.
Step 1: Enable the restrictions you actually want
Settings → Screen Time → Content & Privacy Restrictions → toggle on.
From there, set whatever restrictions matter to you: - Web Content → Limit Adult Websites - Installing Apps → Don't Allow - Account Changes → Don't Allow - Passcode Changes → Don't Allow
This part is the easy part. Almost everyone who's ever opened Screen Time has done at least this much at some point. It's also, on its own, worth almost nothing — because everything here is one passcode entry away from being undone.
Step 2: Set a Screen Time passcode — but not one you choose yourself
This is where almost everyone goes wrong, and it's worth sitting with why. If you set your own passcode, you know it. If you know it, you can enter it and disable every restriction above in under 30 seconds, at 1 a.m., half-asleep, on autopilot, without even fully deciding to.
The only way to genuinely lock yourself out of changing Screen Time is to use a passcode you don't know. Two practical options: - Have someone else set it and not tell you - Use LockIn, which generates a random passcode, reads it to you once for entry, then hides it until your chosen timer ends
Step 3: Remove the recovery path
If you've added an Apple ID for Screen Time recovery, that's a backdoor sitting quietly underneath everything you just configured. Anyone with access to that Apple ID email can reset your passcode in about 60 seconds — including you, which defeats the entire point. See our full piece on the Forgot Passcode loophole for exactly how this works and how to close it properly.
Step 4 (iOS 26 only): Enable Supervised Mode
As of iOS 26, "Limit Adult Websites" no longer blocks private browsing automatically, a change that caught a lot of existing setups off guard. Supervised Mode restores that coverage. Without it, your Screen Time setup has a gap specifically in private tabs — which happens to be the exact place most people would think to look once every other route is closed off.
What "locked" actually means after all four steps
Once these are in place: - You cannot turn off Content & Privacy Restrictions - You cannot change Web Content settings - You cannot install new apps or delete existing ones - You cannot change your Apple ID or passcode - You cannot reset your Screen Time passcode via email
That is a genuinely locked iPhone. Not "it's annoying to undo." Not "it takes a few extra steps." Actually locked, for exactly as long as the timer you set says it is.
The one thing Screen Time cannot do
Screen Time cannot prevent a full device restore via iTunes or Finder on a computer. A factory reset bypasses everything, because it doesn't try to defeat Screen Time at all — it just wipes the device Screen Time was running on. This is an Apple-level limitation, not something any software can fully close. For most people trying to restrict their own phone, the friction of finding a trusted computer and doing a full restore is enough to not matter in practice — it's a very different kind of effort than typing four digits. For those who want to close this gap too, Supervised Mode makes it significantly harder, since a supervised iPhone requires a specific supervisory computer to authorize the restore.
Why this matters more than which specific settings you choose
The four steps above aren't really about Web Content filters or app install permissions specifically — those are just examples. The actual mechanism this guide is teaching is: configure what you want, then remove your own ability to un-configure it. That mechanism works whether you're locking porn access, app installs, social media, or anything else Screen Time can touch. Get the passcode step right and everything downstream of it inherits the same strength.