Access web-hosted game from iOS mobile?

Is there any way to access a web-based game from an iOS or Android? We want to build an HTML5 app that handles the basic 2D interface, and then jumps to a nice 3D unity view when necessary to look at interactive 3D content.

Has anyone tried something like this before? Seems like some kind of a unity app wrapper would make sense, and then tell it where to get or cache it's content from? no idea.