Clicked on an advertisement within an app:
|Microsoft Windows Mobile||29%||71%|
|Apple iPhone OS||26%||74%|
This means that it might be a better idea to make an ad for phones with Android OS instead of making a banner for an iPhone. Naturally this depends on what you are selling. If you are selling the new iPhone it might be a good idea to target iPhone users. Naturally.
Download Nielsen's white paper: The State of Mobile Apps.