This document compares the Android and Windows Phone operating systems. It outlines that Android is an open-source, Linux-based OS developed by Google, while Windows Phone is a closed-source OS developed by Microsoft. It discusses the features of each, including versions released over time. While Android has a large number of apps and customization options, the document notes Windows Phone provides better integration and performance. However, it concludes that Android is now the leading mobile OS due to its open nature and updates, while Windows Phone is no longer supported or receiving updates, suggesting its platform is obsolete.