To get started, open your control center. This is where the screen recording feature is.
If you are using an iPhone with Touch ID, you will swipe up from the lower right-hand corner. If you are using an iPhone with Face ID, you will swipe down from the upper right-hand corner.
Press and hold the screen recording button in order to bring up the microphone option. If the microphone recording is off, it will say microphone off. If the microphone recording is on, it will say microphone on and the icon will be red.
If the microphone recording is not on, click the microphone icon to turn it on. When the icon is red, the microphone recording is on and you can click on the screen to get back to the control center.
Click the screen recording button to start recording. It will count to three before the recording begins.
Start your FaceTime video call as normal. The call will continue recording. You will be able to tell by the red icon in the upper left-hand corner. There is no screen recording limit, however, you may be limited based on the amount of storage available on your device in comparison with the size of the video.
To stop recording the FaceTime video call, click the red icon in the upper left-hand corner of the screen. Then click "stop" to stop the recording process. By default, the recording is usually saved to the Photos app like any other video.
Done! You have recorded a FaceTime video call and you didn't need any fancy, expensive third-party app to get it done.