What "trust" means when your iPhone asks about an app
When your iPhone shows a message asking you to "trust" an process, it is asking for permission to run code that did not come from the App Store. Your phone is designed to block software from unknown sources by default — this is a security feature. Trusting an app tells your iPhone: "I know where this came from, and I want to let it run anyway."
This happens most often when you install an app using a developer's own distribution method, or when you sideload an app (install it directly from a file rather than through Apple's store). Your iPhone needs your explicit permission because once you trust the app, it can access your photos, location, contacts, and other sensitive data on your device.
Key Takeaways
- Your iPhone asks you to trust an app when it comes from outside the App Store, because Apple cannot verify who made it or what it does.
- Trusting an app happens in Settings under General, then Device Management or VPN & Device Management, depending on your iOS version.
- Only trust apps from sources you recognize — a developer's official website, a company you do business with, or someone you know personally.
- Trusting an app is different from granting permissions; trust lets the app run at all, while permissions control what data it can access.
Where to find the trust prompt on your iPhone
The trust message usually appears the first time you try to open an app you installed outside the App Store. It will say something like "Untrusted Enterprise Developer" or "Untrusted Developer" and ask if you want to trust the developer. You have two choices: "Don't Trust" (which blocks the app from opening) or "Trust" (which allows it to run).
If you missed the prompt or need to trust an app later, you can manage this in Settings. Open Settings, go to General, then look for Device Management or VPN & Device Management (the exact name depends on your iOS version). You will see a list of developers or apps you have already trusted. Tap any one to see details, revoke trust, or trust a new app from that developer.
How to trust an app step by step
When the trust prompt appears on your screen, read the developer name carefully. If you recognize it and want to proceed, tap "Trust." Your iPhone will then allow the app to open and run normally.
If you want to trust an app after you have already dismissed the prompt, open Settings, tap General, then tap Device Management (or VPN & Device Management on newer iOS versions). Find the developer name in the list and tap it. You will see the app listed under that developer. Tap "Trust [Developer Name]" to confirm. After that, the app will work like any other app on your phone.
To remove trust from an app later — if you no longer want it to run or you no longer trust the source — go back to the same Settings screen, tap the developer name, and select "Remove." This will prevent the app from opening until you trust it again.
When you should and should not trust an app
Trust an app only if you are certain about where it came from. Safe sources include an official company website (like a bank distributing a beta version of their app), a developer you know personally, or a reputable tech publication testing software. If a friend sends you an app file and you do not know them well or cannot verify they created it, do not trust it.
Do not trust an app if you cannot identify the developer, if the developer name looks misspelled or suspicious, or if someone is pressuring you to trust it quickly. Scammers sometimes distribute malicious apps this way, and once you trust an app, it can access your location, photos, messages, and passwords stored on your phone. Take the same care you would with any software you install on a computer.
The difference between trusting an app and granting permissions
Trusting an app and granting permissions are two separate steps. Trust is the gate that lets the app run at all. Permissions are what you allow the app to do once it is running.
After you trust an app, your iPhone will ask for individual permissions — access to your camera, microphone, location, contacts, photos, and so on. You can grant some permissions and deny others. For example, you might trust a weather app but refuse to let it access your contacts. Denying a permission will not prevent the app from running; it will just prevent that specific app from using that specific feature of your phone.
What happens if you trust the wrong app
If you trust an app and later realize it is malicious or from an untrusted source, you can revoke that trust when ready. Go to Settings, General, Device Management (or VPN & Device Management), find the developer, and tap "Remove." The app will stop working right away, and you can delete it from your home screen.
If you are concerned the app may have stolen data before you removed it, change your passwords for sensitive accounts like email and banking. If the app had permission to access your photos or location, review your recent activity in those apps to see if anything looks unusual. Apple does not scan apps you sideload the way it scans App Store submissions, so your own judgment about the source is your main protection.
Why the App Store exists and why some apps are distributed differently
Apple reviews every app in the App Store before it is published. This process is meant to catch malware and apps that violate Apple's rules. Developers sometimes distribute apps outside the App Store because they want to avoid this review process, because their app does not meet Apple's guidelines, or because they want to give early access to testers.
Enterprise apps — software a company builds for its own employees — are also often distributed outside the App Store. A bank might create an internal app for staff, or a large company might distribute a beta version of software to test it before release. These are legitimate reasons to trust an app from a source other than the App Store, but they require you to know and trust the organization behind it.
Frequently Asked Questions
What does "untrusted enterprise developer" mean?
It means the app was signed by a company's developer certificate, not by an individual. Enterprise apps are usually for employees of that company. If you work for the company and your IT department gave you the app, it is safe to trust. If you do not work there, do not trust it.
Can I trust an app without opening it first?
No. The trust prompt only appears when you try to open an app for the first time. You cannot pre-trust an app. Once you tap "Trust" in response to the prompt, the app will open and run normally from then on.
If I trust an app, can it access my data without asking?
Trusting an app lets it run, but it still cannot access sensitive data without your permission. After you trust the app, iOS will ask separately for permission to use your camera, location, contacts, photos, and other features. You can grant or deny each permission independently.
Is it safe to trust apps from a developer's website?
It depends on the developer. If it is a well-known company like a bank or software maker, and you are on their official website, it is usually safe. If you are unsure whether a website is official, search for the company name and find their main website independently rather than following a link someone sent you.
What should I do if I accidentally trusted a suspicious app?
Go to Settings, General, Device Management (or VPN & Device Management), find the developer, and tap "Remove" when ready. Then delete the app from your home screen. Change passwords for any sensitive accounts if the app had permission to access them.