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iPhone Design Concept - Light Sensor As we know, iPhone can automatically regulate the luminance of the screen based on the surrounding environment. This function mainly benefit from the light sensor. This special design can not only save power for users, but also get users with the best visual effects. iPhone Design Concept - Infrared Sensors If you've used iPhone before, you must have noticed that when your cheek close to the screen, the screen would automatically closed. This phenomenon is caused by the special use of infrared sensors. When you bring the phone to your cheek, the system will think that you are answering a call. So it will turn off the screen spontaneously in order to save power. iPhone Design Concept - Acceleration Sensor The friendly design concepts also come in the acceleration sensor, which will protect machine from the fall injury. When the machine is in free fall, which means that the phone is falling from a height, the operation system will spontaneously shut down to reduce unnecessary damage that may be caused by the fall. iPhone Design Concept - Humidity Sensor If you unguarded fell iPhone into the water or take it into the steam room, the operating system will detect the changes in humidity, and will also spontaneously shut down to decrease the possible unnecessary damages. The high-humidity environments may cause short circuit and other mechanical failures on the electronic components. So the use this technology (humidity sensor) can well protect the security of electronic components of iPhone. That all about the iPhone design principles. Hope this will help you to have a more comprehensive understanding on iPhone.