How to Install IPA File on iPhone
                
            Unlike apps from the App Store that can run directly after been downloaded on the iOS devices, there are 3 several steps you need to do to install the ipa file on your device and run the app.
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                    Step 1:Tap Install to download the IPA file on your iPhone.
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                    Step 2:Tap Settings > General > Profile & Device Management; you will see the developer of this IPA file under "Enterprise Apps".
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                    Step 3:Tap the Enterprise name and then tap “Trust” on the pop up window to confirm your choice.