Tired of low-quality cell phone calls? Thanks to FaceTime, you can make audio-only calls with crystal-clear high-resolution sound using an iPhone, iPad, iPod Touch, or Mac.
Facetime, the built-in video calling app on Apple devices, has an undisputed audience base. Besides its video calling services, users also count on it for making audio calls to their friends. Reason being, its seamless and error-free connectivity in a secured environment.
This is for the iPhone, iPad, iPod Touch, and Mac. Screenshots are from an iPhone

FaceTime Audio Explained
Most people think of FaceTime as a video chat service, but it also supports audio calls that operate like regular phone calls. Your device’s video camera is not used, and it stays off during the call.
FaceTime Audio is a great alternative to regular phone calls because it uses the Internet to place free calls with crystal-clear high-definition audio compared to a regular phone call. Since it’s an Internet call, your Apple device can take advantage of the extra bandwidth to make the call sound much better. The only requirement is that both ends of the call own Apple devices that support FaceTime, which includes iPhones, iPads, iPod Touches, and Macs.
Make a FaceTime Audio Call
First, on your iPhone, iPad, or iPod Touch, launch Settings (the gear icon). Refer to below image:

Next, scroll down and tap the FaceTime option. See below image:

In the FaceTime settings, toggle the switch beside the FaceTime option to turn it on. See following image:

Now, search for the FaceTime app from your Search screen (your first or last screen) or locate the app on a Home screen. Refer to below image where we are searching for the app:

Next, launch the FaceTime app. On the main FaceTime screen, tap the plus button (+). See below image:

In the To: field, enter the name or number of the person you are trying to call. As you type, your Contacts list will be searched and any matching contacts will appear below. Just tap to select the person you want to call. See following image:

Next, tap the Audio button. If the Audio button is greyed out or does not appear, the contact you are trying to call does not have FaceTime enabled or has not set up a FaceTime account. Refer to below image:

Your call will be placed. You will see a message at the top of your screen denoting this is a FaceTime Audio call. During the call, you can switch to a video FaceTime call using the FaceTime icon, or you can disconnect by tapping the red phone receiver icon. See below image:

Making a FaceTime Audio call on the Mac is similar to the above steps. One of the coolest things about FaceTime is that it works between all major Apple devices, so you can use your Mac to call iPhones, iPads, and iPod Touches.
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