Hardware and software made for each other.

Because Apple makes both the iPhone hardware and the operating system, everything works together seamlessly and intelligently. This integration enables apps to take full advantage of iPhone hardware features such as the Retina display, the Multi-Touch interface, the accelerometer, the three-axis gyro, accelerated graphics, and more. FaceTime is a perfect example. It uses both iPhone cameras, the display, the microphone, and your Wi-Fi connection.