We setup Ad manager for mobile device, and assigned it to some videos, but we confirmed Ad was not played on Windows Phone and old Android devices. We used HTML5 player and default browser.
Android, Windows Phone, Windows Mobile
Android, Windows mobile OS
We have a limited support on Windows Mobile with Ooyala. The HTML5 player supports Ad playback on Windows Phone and Windows Mobile as long as the Ad has an mp4 format and only if the Ad Network also supports Ad Playback on Windows.