How to block porn on iPhone, when you are the one being blocked

iPhone has a built-in adult-content filter, it is free, it works in every browser rather than just Safari, and you can turn it on in about two minutes. Here is the path: Settings → Screen Time → Content & Privacy Restrictions → App Store, Media, Web & Games → Web Content → Limit Adult Websites.

That is the whole answer, and most guides stop there. The problem is that they are answering a different question than the one you are asking.

Why the other guides do not fit your situation

Search this and you will find a dozen well-written pages from parental-control companies. Every one of them assumes the same thing: an adult is setting up a restriction on a phone belonging to someone else, and that adult keeps the passcode.

You are doing something else. You are setting a restriction on your own phone, which means at the moment it matters most, you are both the person being blocked and the person holding the key. A filter you can lift in twenty seconds is a different tool with a different purpose, and it is worth being clear-eyed about which one you have just installed.

That does not make it useless. It makes it useful for a narrower, more specific reason — which is the last section of this page.

The setup, properly

1. Set a Screen Time passcode that is not your device passcode.

Settings → Screen Time → Lock Screen Time Settings. If you skip this, the filter is a toggle you can flip back with no friction at all, which defeats the point. Use four digits you do not already use somewhere else.

2. Turn on the web filter.

Settings → Screen Time → Content & Privacy Restrictions. Switch on Content & Privacy Restrictions at the top, then go to App Store, Media, Web & Games → Web Content → Limit Adult Websites.

Apple has moved this screen more than once — it sat directly under Content & Privacy Restrictions before the App Store, Media, Web & Games grouping existed. If your iPhone does not match these words exactly, search “Web Content” in Settings.

3. Add the specific sites you actually go to.

Still on the Web Content screen, under Never Allow, tap Add Website and enter them. Apple’s automatic category is broad but not exhaustive, and the handful of sites in your own history are the ones that matter. This step takes the longest and does the most.

4. Decide about the passcode.

Here is where it gets honest. Three options, in ascending order of how much they actually hold:

• Keep the passcode yourself. Weakest. It is a speed bump, and on a bad night speed bumps lose.
• Give it to someone else. A partner, a friend, a sibling — someone who will not hand it back the moment you ask. This is the oldest accountability mechanism there is and it still outperforms most software.
• Never know it at all. There are services that generate a random Screen Time passcode and walk you through entering it without ever showing you the full sequence, so there is nothing to recall. Effective, and genuinely irreversible without a full device reset — which is the point, and also the risk. Do not do this without understanding that last part.

Where it leaks

Three places, and no guide that omits them is being straight with you.

Private browsing is no longer disabled by this setting. Turning on Limit Adult Websites used to remove private browsing from Safari. As of iOS 26 it does not. If that matters to you, the stricter Only Approved Websites mode does still restrict private tabs — at the cost of turning your phone into an allowlist-only device, which most people will not accept.

Coverage is uneven outside the big browsers. The filter is genuinely system-level rather than a Safari extension, so Chrome and Firefox are covered too. But privacy-focused browsers and some in-app web views — the browser inside a social app, for instance — are filtered less reliably. The leak is usually not a browser at all. It is an app with a feed.

It is your phone. You can delete the passcode by erasing the device. You can pick up a laptop. You can walk to a different room. This is true of every blocker ever made, on every platform, and anyone telling you their product cannot be bypassed is selling something.

So what is it actually for?

Not for making the thing impossible. For removing the ten-second decision.

Almost no relapse is a considered choice made over several minutes. It is a gap — between an urge arriving and a tab opening — that is short enough to cross before the part of you that did not want to do it has caught up. A filter does not win an argument with that urge. What it does is stretch ten seconds into several minutes of deliberate, conscious effort: unlock Screen Time, find the setting, turn it off, wait for it to apply.

Several minutes is usually enough for the urge to become something you can look at rather than something you are inside. That is a real mechanism, it is well worth two minutes of setup, and it is a much smaller claim than the one most of this industry makes.

If you want the same thing on Android, or you want to know what IronWill’s own blocker does differently on each platform, that is written up here — the short version is that we use exactly the Apple filter described on this page, through the same system APIs, rather than running one of our own.

If the urge is here right now

Everything above is a wall you build in advance. It is the wrong tool for the next ten minutes.

For the next ten minutes, the techniques that work on the body rather than on willpower are the ones to reach for — breathing, grounding, a timed lock that simply refuses to let you proceed for sixty seconds. Willpower is precisely the thing you have least of right now, so the useful tools are the ones that do not require any.

And if you are wondering how long this stays hard: nobody can give you a date, and the confident timelines you will find elsewhere are not sourced. What is true is that the ten-second gap gets easier to cross deliberately, long before the urges stop arriving.