I doubt Nat Geo would accept a photo spread shot with an in-phone camera. But on the other hand I've a friend of fifty+ years who has published a book of images (of his cats, no less) all taken with his 'phone:
http://www.jayspeyerer.com/product.htmNo financial affiliation... I had to buy it, too.
The images are perfectly acceptable for the size and format of the book.
