iOS Tip 107 - Enable 4K Video

The iPhone 4K video recording feature is turned off by default because of the significant storage requirements that are necessary to capture and record 4K video. To turn it on:

You’ll need a new iPhone with 4K video support to have this feature available, which is the 6S or better:
1 Open the Settings app and go to “Photos & Camera”
2 Scroll down to “Camera” and tap on “Record Video”
3 Select “4K at 30 fps” to enable 4K video recording with the iPhone camera
4 Exit out of Settings