New Delhi, July 7 -- Detail is everything, especially in phones from companies that want to make them more compact, easy to carry, and instantly recognisable. No design component is random or coincidental, including that tiny hole next to the camera lenses on your iPhone. If you look closely at most modern smartphones, you'll spot a similar little dot near the camera array. It's not a flaw or a dust trap, it's there for a reason.

That tiny hole is actually a dedicated microphone, one of four microphones built into your iPhone. While the two at the bottom handle your voice during calls and the one on the front takes care of video chats and voice commands, the rear microphone is all about capturing clear, directional audio when you're reco...