Are you using PhoneGap Build?
I am not using it right now. I want to know the minimum ios and android supported by the PhoneGap to decide is this framework will work with my requirements?
It depends on the cordova-ios and cordova-android platform versions you use.
Last cordova-ios version supports iOS 9 and greater
Last cordova-android version supports Android Jellybean and greater (SDK version 16).
You can still use older platform versions if you want support older iOS or Android versions