In terms of technology development this article was written a century ago, nowadays most smartphones ALWAYS have dual camera (back and front) some even have dual front camera, and the middle-high class smartphones almost always have more than 5 inches display. On the other hand most high-end tablets can also make call, send text and have 3G and 4G connectivity I would rather say smartphone is a pocket camera that has GPS and wi-fi cellular connectivity and tablet is a bigger smartphone