On this page you will find the I Knew You Were Trouble. ringtone in several versions, all free to download. The song is performed by Taylor Swift. There are 6 versions, from 14 to 49 seconds long. If you like r&b, slow and pop ringtones, see the tags below. For iPhone or iPad download the .M4R file. For Android and other phones download the .MP3 file. More ringtones by Taylor Swift are on the artist page, the link is under the title.