Most parents who search for how to limit screen time on an iPhone have already tried. They found the setting, picked a number, tapped save — and within two weeks the limit had quietly stopped meaning anything. The child asked for "one more minute" every night, the parent kept tapping approve, and the whole thing dissolved back into a nightly negotiation.
So this guide covers both halves of the problem. First, exactly how to set a limit on an iPhone. Then the part almost no guide covers: how to keep the limit from eroding.
Method 1: Set a Daily App Limit
App Limits are the core tool. They cap how long an app or a whole category can be used each day, and the clock resets at midnight.
- Open Settings > Screen Time on your child's iPhone.
- Tap App Limits, then Add Limit.
- Choose a category (Social, Games, Entertainment) or expand it and pick individual apps.
- Set the daily allowance and tap Add.
A practical tip: limit by category rather than by app wherever you can. If you limit TikTok specifically, your child installs a different app and the limit is irrelevant. If you limit the whole Social category, new apps land inside the existing budget automatically.
Method 2: Schedule Downtime
Downtime blocks everything except the apps you explicitly allow (and phone calls) during set hours. This is the right tool for bedtime and school.
- In Screen Time, tap Downtime and switch it on.
- Choose Every Day or Customize Days — customize is better, since school nights and weekends rarely deserve the same rules.
- Set the start and end times.
- Go to Always Allowed and trim it down. By default Apple allows more than most parents expect.
If bedtime is the main thing you are trying to fix, the schedule matters more than the daily total. Our guide on how screen time affects your child's sleep explains why a firm cutoff outperforms a shorter allowance.
Method 3: Set an Overall Downtime for Categories You Never Want Open
Under Content & Privacy Restrictions > Allowed Apps, you can switch off built-in apps entirely — Safari, AirDrop, the App Store. This is heavier-handed than a limit, but for younger children it is often the simpler answer than trying to budget something they should not have unsupervised access to at all.
The Step Everyone Skips: Lock It Down
A screen time limit with no passcode is a suggestion. Go to Screen Time > Lock Screen Time Settings and set a four-digit code that is different from the phone's unlock passcode. If they match, your child can turn off every limit you just configured in about eight seconds.
Choose something they cannot guess or watch you type — not a birthday, not the house alarm code, not the same code you use on your own phone.
Why the Limit Stops Working After a Week
Here is the pattern almost every family runs into. The limit is set correctly. It fires. Your child hits the wall mid-game and asks for more time. You are cooking dinner, or driving, or just tired, so you tap "Approve for 15 minutes."
Do that four nights running and you have taught your child something precise: the limit is not a limit, it is the moment the asking begins. The technical setting is still there. The boundary is gone.
This is not a discipline failure. It is a design problem. Apple's tools give you exactly two options at the moment the timer runs out — say no and absorb the conflict, or say yes and undermine the rule. Neither one builds anything.
The Fix: Give the Extra Time a Price
The families who make limits stick tend to have one thing in common: extra screen time is earnable but not askable. There is a way to get more, and it is not pestering a parent at 8pm.
This is the specific gap Tap Guardian is built for. You set the daily limit once, and it runs on its own — no nightly approval prompt landing on your phone. When your child wants more time, they do not negotiate with you. They complete something you have already decided is worth it: a chore, homework, reading, or a Brain Boost quiz. The minutes are added automatically when the task is approved.
The difference in practice is that the conversation stops being "can I have more" and becomes "what do I need to do." You are out of the enforcement role, which is the role that generates all the friction, and the limit holds because nobody has to defend it every night.
Tap Guardian runs on iPhone and Android from one parent dashboard, so a household with a mix of devices is managing one set of rules rather than two systems that behave differently. Every family starts with a 14-day free trial, no credit card required; after that it is $6.99/month or $49.99/year.
Set the Number With Your Child, Not At Them
Whichever tool enforces the limit, the number lands better when your child had a say in it. Ask what they think is fair, say what you think is fair, and settle somewhere defensible. A limit your child helped set is one they are far less likely to treat as an obstacle to route around. Our guide on how to talk to kids about screen time has scripts for that conversation, and our age-by-age guide gives sensible starting numbers if you want a baseline.
Review It Monthly
Screen Time reports show you what is actually being used, which is frequently not what you assumed. Check the weekly report once a month and adjust. A limit that made sense in October may be wrong by March — kids change, schoolwork changes, and a rule that no longer fits reality is a rule that invites being ignored.
Final Thoughts
Limiting screen time on an iPhone is a two-minute setup and a long-term habit. Set the app limits, schedule Downtime, and above all lock it with a separate passcode. Then solve the part the settings cannot: make extra time something your child earns rather than something they ask for. That single change is what turns a limit into a boundary that survives contact with a determined ten-year-old.
If your limits are already set and simply not firing, start with why iPhone Screen Time stops working and how to fix it.