I have developed many windows and android applications for many big companies few links are https://www.windowsphone.com/en-us/store/app/ringo-low-cost-international-calling/a02896d4-9b49-40d3-90e3-ad5bfc812eb6 https://www.windowsphone.com/en-us/store/app/flock-beta/dd0e9b47-f7a3-436f-b514-57ce78560913 https://play.google.com/store/apps/details?id=com.qangru.app I have great experience in windows phone and android