For users of iOS devices, FaceTime is a great app to help different users connect by making regular phone calls or video calls over the Internet without incurring regular call charges.

1. What is FaceTime?
FaceTime is an application for making calls between Apple devices such as iPhone, iPad, and Mac computers. It was first introduced alongside the iPhone 4, which had a front-facing camera that could be used for video calls. Despite the proliferation of other OTT (Over The Top) calling and messaging apps like Google Hangouts, Messenger, and Zalo, FaceTime remains popular due to its integration with the iPhone's contacts and ease of use. However, its major drawback is that it is exclusive to Apple devices and not available on Android phones.
2. How to make FaceTime calls on iPhone
To make FaceTime calls on iPhone, you need to enable FaceTime on your iPhone first. Here's how:
Step 1: Go to Settings => FaceTime => Toggle the FaceTime switch to On

Step 2: Sign in with your Apple ID.

Step 3: Open the Phone app => Contacts and try opening any contact that has FaceTime activated as shown below. Tap the video icon to make a FaceTime video call or tap the phone icon to make a FaceTime audio call.

FaceTime call dialing interface

FaceTime audio call (left) and FaceTime video call (right)
Through this article, you have understood what FaceTime is and how to make FaceTime calls on iPhone. Use FaceTime regularly when contacting friends to make conversations comfortable without worrying about call charges. Wish you success!
