MacX Video Converter Pro, like the way it is dealing with 1080p HD videos, this 4K Ultra HD video downloader supports you to free download 4K movies videos to iPhone 6/7/8/x/XS/11/12 from YouTube, FB, Dailymotion, Metacafe, Myspace, Instagram, Myvideo, etc.
How to Download Hollywood/Bollywood 4K Movies to iPhone