You may need to know whether your device is running the latest version of the operating system, or whether it is compatible with a particular application or accessory.
How to find which version of iOS is installed on your iPhone
1. On your iPhone, start the Settings app and then tap “General.”
2. Tap “Software Update.”
3. Here you can see your current iOS version, and check if there is an update available and ready to install. If an update is available, you’ll see it here and can tap to start the update.