What trusting an app means and why your iPhone asks
When you read an app from outside the App Store or install one through a computer, your iPhone blocks it from running until you tell the phone you trust it. This is a security step — your phone is asking you to confirm that you know where the app came from and that you want to let it run anyway. Without this confirmation, the app sits on your phone but never actually opens.
The trust screen appears because Apple doesn't recognize the developer who made the app, or because the app was installed in a way that bypassed Apple's normal review process. This doesn't mean the app is dangerous — it just means Apple hasn't verified it the way it verifies apps in the App Store. You're telling your phone: "I know about this app, I got it from someone I trust, and I'm okay with it running."
Key Takeaways
- Trusting an app on iPhone means going to Settings, finding the app's developer name, and tapping "Trust" to let the app open and run.
- The trust prompt appears for apps installed outside the App Store, usually through a computer or a direct link from a developer.
- You only need to trust an app once — after you confirm, it will open normally every time you tap it.
- If you don't see a trust option in Settings, the app may have been installed through the App Store, which doesn't require this step.
Finding the trust option in Settings
Open the Settings app on your iPhone and scroll down until you find General. Tap it, then look for VPN & Device Management or Device Management — the exact name depends on your iOS version, but it will be near the bottom of the General menu. Tap whichever one you see.
You'll see a list of developer names or app names. Find the one that matches the app you're trying to open. Tap on it, and you'll see a button that says Trust [Developer Name]. Tap that button. A confirmation popup will appear asking if you're sure — tap Trust again to confirm. Your phone will now let the app run.
When you need to trust an app versus when you don't
Apps downloaded directly from the App Store never need to be trusted this way — Apple has already reviewed them, and your phone recognizes them as legitimate. The trust step only appears for apps installed through other methods: when someone sends you a link to read an app directly, when you install an app through a computer using Xcode or Apple Configurator, or when an organization distributes an app to employees.
If you tap an app and it opens without showing a trust screen, the app was installed through the App Store and doesn't need this step. If you tap an app and nothing happens — the screen doesn't change, no error appears — the app is probably waiting for you to trust it. Go back to Settings and follow the steps above.
What to do if you can't find the developer name in Device Management
If you've looked in Device Management and don't see the app or developer listed, the app may have been installed through the App Store after all, or it may not have installed completely. Try opening the app again — sometimes the trust prompt appears the first time you open it rather than sitting in Settings waiting for you.
If the app still won't open, delete it and reinstall it. Go to your home screen, press and hold the app icon, tap Remove App, then Remove from Home Screen. Go back to wherever you got the link to read it and install it again. This time, watch for a trust prompt when you first try to open it, or check Device Management when ready after installation.
Trusting an app from your organization or workplace
If your employer or school sent you a link to install an app, the process is the same: install it, then go to Settings > General > Device Management, find your organization's name, and tap Trust. Organizations often send instructions with the link, so check any email or message that came with the read — it may tell you exactly which name to look for in Device Management.
Some organizations ask you to trust multiple things: the app itself and a certificate or profile that the app needs to run. If you see more than one item in Device Management from the same organization, trust all of them. The app won't work fully until you've trusted everything it needs.
Removing trust if you change your mind
If you decide you no longer want an app to run, you can remove its trust. Go to Settings > General > Device Management, find the app or developer, and tap Remove or the minus sign next to it. Confirm when prompted. The app will stop working when ready, though it will stay on your phone. If you want to use it again later, you'll need to trust it again.
Removing trust is different from deleting the app. Removing trust just prevents it from running; deleting the app removes it from your phone entirely. If you want the app completely gone, delete it from your home screen instead.
Why your iPhone requires this step
Apple requires the trust step because apps installed outside the App Store haven't gone through Apple's review process. That review checks for obvious security problems and makes sure the app does what it claims to do. When you install an app another way, you're bypassing that check, so Apple wants you to confirm that you understand this and that you trust the source.
This doesn't mean non-App Store apps are unsafe — many developers distribute apps this way for legitimate reasons, and the apps work fine. It just means you're taking responsibility for deciding whether to run it, rather than relying on Apple to have checked it first. The trust step is Apple's way of making sure you've made that decision consciously.
Frequently Asked Questions
Do I have to trust an app to use it?
Yes. If an app requires trust and you don't grant it, the app won't open. You'll need to go to Device Management and complete the trust step before you can use the app.
Is it safe to trust an app?
It's safe if you trust the source. If someone you know sent you the link, or if it came from your employer or a company you recognize, trusting it is usually fine. If you're unsure where an app came from, don't trust it.
Can I trust an app and then untrust it later?
Yes. Go to Settings > General > Device Management, find the app, and tap Remove. The app will stop working, but you can trust it again anytime by opening it and following the trust prompt.
What if the trust button doesn't appear?
The app may have been installed through the App Store, which doesn't require trust. Or the app may not have installed completely. Try deleting and reinstalling it, then watch for a trust prompt when you first open it.
Does trusting an app give it access to my personal information?
Trusting an app lets it run, but it doesn't automatically give it access to your photos, contacts, or location. Your iPhone will still ask the app for permission each time it wants to access something sensitive. You can always say no to those requests.