Interesting considering the iPhone is more expensive than the iPad. The actual price just gets masked by subsidies on 2-year contracts with expensive monthly plans.
Price is not the only factor obviously.
Smartphones are used to provide basic and advanced tools that allow the owner to communicate via different networks.
Tablets provide an expensive alternative with larger screens, less usability and less capacities, while offering a better way of enjoying media content of any kind than their smartphone counterpart.
If you can't understand it yourself, too bad; I have no interest in discussing such an obvious statement.