Unknown Caller

"Unknown Caller"
Song by U2
from the album No Line on the Horizon
Released27 February 2009
GenreRock
Length6:03
LabelIsland
Songwriter(s)U2, Brian Eno, Daniel Lanois
Producer(s)Brian Eno and Daniel Lanois, with additional production by Steve Lillywhite

"Unknown Caller" is a song by Irish rock band U2 and the fourth track on their 2009 album No Line on the Horizon. It was written from the perspective of a drug addict, who begins to receive bizarre text messages on his cellphone. The song was developed very early during the No Line on the Horizon sessions, and was recorded in a single take.