But what about the iPhone as an essential business tool? For mission-critical enterprise applications that require a robust and secure operating system, a recent Gartner Group study suggests treading carefully. On the other hand, the iPhone just hit the top of J.D. Power’s satisfaction ranks for business smartphones, so some enterprises will undoubtedly find it useful. Perhaps the question should be: Can the iPhone make you more productive when you’re mobile? The answer is clearly yes.