When do screen orientation changes matter?
There are 4.77 billion mobile phone users spread all over the world. They can choose between 2.8 million apps on the Android platform and over 2.2 million on Apple's App Store. Mobile phones are used in schools, on the streets, in the buses, inside personal cars, everywhere. The statistics confirm that it's a real challenge to deal with the mobile device diversity. The app should work and look good on all devices, regardless of their size, orientation or capabilities. Currently, the most popular screen size is 5.4 inches (i.e. iPhone 6) because it was rated as the best size that fits the human hand. Recent studies show that most users hold their phones with one hand and that they prefer portrait mode. However, they often rotate their devices from ergonomic reasons.