Tap the Settings icon on your iPhone desktop.
Once you're on the Settings page, pull down the page a little, and then click the General button.
Go to the \"General\" page and find the \"Description file\" function in the page and click on it.
After that, the list of untrusted files in the phone will appear on the \"Description file\" page. Click the enterprise application that is not subject to information files displayed in the dialog box.
At this time, the mobile phone will enter the enterprise application page of the file, and we can click the blue button in the page.
Then the page will pop up a dialog box to trust the application, we click the red \"Trust\" button in the dialog box.