<p> It's simple to download an YouTube video in the Mp3 file format for free of charge on your iPhone. You have a variety of apps that can help you. It is important to consider the implications of copyright. After careful consideration, here are a few applications that can be used to convert YouTube videos into MP3 or MP4 files on your iPhone/MacOS-based device. An Apple device, to sa... https://www.theversed.com/members/marblecrack89/activity/572201/