We probably have different standards for what makes a "great" print. Mine, which are of course very subjective and distinct from the artistic quality of the content, involve having a file that outresolves the printing method to the far corners precisely resampled to what the drivers expect (200 or 400 ppi for Lamdba c-prints, 360 or 720 for Epson inkjets, etc.). This would result in very small prints with a phone, even disregarding other more subtle issues.
