There are several ways to download songs from YouTube to iPhone for free and listen offline but here are two methods: 1.       Using a third-party website, YTMP3 2.       By Subscribing to YouTube Premium Account 1.       Using YTMP3 ·       Open YouTube and play the song of your own choice ·       Copy the link by clicking on the “Share” link ·       Now, open Safari Browser and go to YTMP3 ·       Paste the copied link in the YouTube video converter field, select the format mp3 or mp4 and tap the “Convert” button   2.       YouTube Premium To download songs from YouTube on iPhone, YouTube Premium is the best-paid option to stream, listen online and download MP3 songs on your iPhone. All you need to do to install the Official YouTube Music App on your phone and subscribe to its premium plan including one month's free trial.