Extra Hole at the Back of IPhone
If you are an observant iPhone holder, you have probably noticed a tiny hole at the back of the phone beside the camera lens. Some people suspect that it is one more camera that helps secret agencies to keep you under surveillance. Relax; it is not like that at all: it is just the third microphone that is introduced by iPhone makers starting from its 5th model.
The first two are on the mobile’s bottom edge and under the speaker grill. Such combination allows iPhone to catch sounds no matter which side of it they come from. In addition, they are very convenient for voice recognition and video shooting.