Final answer:
To check when an app was installed on an iPhone, open the App Store app, tap on your profile picture, scroll down to 'Purchased', and look for the app with the installation date next to it.
Step-by-step explanation:
To check when an app was installed on an iPhone, you can follow these steps:
- Open the App Store app on your device.
- Tap on your profile picture or the icon in the upper right corner.
- Scroll down and tap on 'Purchased'.
- You will see a list of all the apps you have ever downloaded. Look for the app you are interested in and check the date next to it. This will indicate when it was installed.
For example, if you see 'Jan 12, 2022', it means the app was installed on January 12, 2022.