In iOS 7, Apple introduced a feature called FaceTime audio that offers sound quality that is far batter than anything we had ever experienced before on the iPhone. It makes people’s voices sound more like, well, people’s voices. FaceTime audio works just like regular FaceTime calling; you can make a call to anyone with an iOS device that's running iOS 7, and it's completely free because it uses your data plan or Wi-Fi to make calls.
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Here’s how to make calls on your iPhone sound 100 times better -- for FREE!