Smartphones have now become the norm for most people. It's a product which many have and are willing to shell out quite a bit of money for. More are more smartphones are being sold everyday and the growth isn't stopping any time soon. Apple seem to be one of the best examples in terms of smartphone growth. Their iPhone is their most popular product but when they first started up they were a computer company. The iPhone now makes 40% of their revenue, that's a massive chunk, even when they sell a whole range of other products.