While iPhone calls these days are vastly better than those of iPhone models in the past, let a lone calls made on those old flip phones, they can still be pretty cruddy, depending on your service coverage and location within that area.
If you’re at home (or at a place with WiFi) and in a bad location for cell tower reception but still need to make a voice call, you can do one thing to immediately improve the audio fidelity of your iPhone to iPhone calls: use FaceTime Audio.
It’s amazing how many of us just haven’t tried FaceTime audio, even though it was a big selling point of iOS 7 when Apple announced it back before the release of the latest iOS software.
There are two ways to use FaceTime Audio. The first way is to tap into a Contact on your iPhone, either in the Contacts app itself, or in the Phone app. For example, launch the Phone app and tap on the Recents tab at the bottom of the screen. Tap the little information icon to the right of any of the Contacts there you want to chat with. About halfway down the Contact screen, you’ll see the FaceTime section, and you’ll have the option to tap either the video or audio icon. Tap the little phone icon and an audio-only call will start, via FaceTime.
The other way to start a FaceTime call is in the FaceTime app itself. Tap on the app icon on your iPhone’s home screen, and then you’ll see the recent FaceTime calls you’ve made. You can tap on the little informational icon to the right, as above, or tap on the Contacts button in the lower right to choose a contact to chat with via FaceTime.
Simple, yet something that will dramatically improve your audio quality in any voice call you use it in. Of course, whoever you call will need to have an iPhone or Mac, since you can’t call non-Apple phones or landlines with FaceTime audio.
Via: Gotta Be Mobile