In the past people have many problems with respect to the flips on the sensors when ever they are in any conversation, phone call or any skype communication. Here the benefit of iPhone 4s is that it runs on the infrared detectors when ever the screen of the iPhone is turned on. With the help of Siri you can also know how close your face is with the handset when you are about to say something or you have pressed the handset up against your face.
For more information you can all see different videos of Siri’s benefits on youtube, twitter or any other channels. So these are the reasons of why Siri is important for iPhone 4s and why it is so high in demand.