"It's an album that's been taken to heart by a very particular audience and it hasn't popped the pop consciousness so in that sense it didn't achieve what we wanted. Yet it's a great piece of work."
- Bono two years after the No Line On The Horizon release
The lyric "3:33 when the numbers fell off the clock face" from Unknown Caller is a reference to the Bible verse Jeremiah 33:3. Bono refers to it as "God's phone number".