First of all, let's be honest, the AR technology on mobile devices is very far from its true potential. Because of obvious technical limitations, it takes only baby steps toward the full expression of its talents. In some cases, the name of the technology itself has a greater affect on the audience than the real application's functionality. This means that to provide a truly viable product, rather than a single-purpose, technical gimmick, you should be less-ambitious, and the goals should be chosen very carefully and maturely.
Remember that there is no truly reliable way to generate an accurate model of reality on the screen of a smartphone camera yet. Modern devices can scan and recognize only a small part of the real world, since the screen representation is only an illusion and you have do your best to make it very convincing and attractive. Modern AR solutions should be used on iOS devices only when there's a creative idea and it is clear that a game will gain some...