Hot on the heels of releasing a new version of OneNote for the Mac, Microsoft is pushing out some updates to its corresponding iOS and Android apps. For starters, there are no longer separate applications for the iPhone and iPad; in fact, iPad users will be prompted to re-download the app the next time they launch it. The main benefit here seems to be that Microsoft has an easy way of porting over all the features from the more advanced iPhone app, without having to re-code them for the tablet version. That means, for instance, that you can now access OneNote from the Notification Center on the iPad, the same way you already can with the iPhone. Microsoft also brought over the "recent notes" view, along with the ability to see page previews in landscape mode. Lastly, this update fixes a bug that caused problems with the whiteboard camera.

http://www.engadget.com/2015/07/16/onenote-ios-android/