You now have an app that functions correctly on all devices. You can see how using the Collection View gives your app some variety on different devices with very little code. As you get more and more comfortable with this, you will find other ways to make your app look unique on various devices.
We could submit the app as is right now and it would be perfectly fine, but why not take advantage of some additional features that you can implement?
In the next chapter, we will do just that by creating an iMessage app for our app.
