How to Fix iOS “Untrusted Developer” Error

When you try to install and run your own developed app on an iPhone, you might see an error like Untrusted Developer, which prevents you from installing the app.

Untrusted Developer
Your device management settings do not allow using apps from developer "Apple Development: ***** (***)" on this iPhone. You can allow using these apps in Settings.

This error can be resolved by trusting the developer in your iPhone's settings.

Open the Settings app and go to General.

Select VPN & Device Management.

Under Developer App, you will see the untrusted developer listed. Tap on it.

Tap Trust for the displayed developer.

A confirmation pop-up will appear. Tap Trust again to confirm.

Now, this developer is trusted, and you can install and run the app on your iPhone.

That's it! You have successfully fixed the Untrusted Developer error on iOS.