In this chapter, we started out learning the process of setting up iOS provision profiles to deploy to iOS devices. Next, we looked at the required device settings to deploy your application to an Android device. We discovered the Xamarin linker and how it can make your applications smaller and perform better. We went over the various settings to resolve problems caused by your code and the linker, and we explained AOT compilation on iOS and the limitations that occur. Finally, we covered the most common memory pitfalls that can occur with Xamarin applications.

Testing your Xamarin application on mobile devices is important for various reasons. Some bugs are only displayed on the device due to the platform limitations that Xamarin has to work around. Your PC is much more powerful, so you will see different performance using the simulator rather than on a physical device. In the next chapter, we'll create a real web service using Windows Azure to drive our XamChat application. We will use a feature called Azure Mobile Services and implement push notifications on iOS and Android.