I have more than 2 years of experience in mobile apps of phonegap/Cordova and and also in windows.
We created the PhoneGap Developer mobile app so that you can quickly see how your mobile app looks and works. Develop locally then instantly see changes on your connected mobile device - without the need to re-sign, re-compile, or reinstall your app to test your code. By testing your PhoneGap app on a mobile device, you get access to device APIs that aren’t available in web browsers.