+44 (pronounced "Plus Forty Four") was formed by former blink-182 members Mark Hoppus (bass guitar and vocals) and Travis Barker (drums and keyboards). +44 is a supergroup that consists of former Transplants touring guitarist Craig Fairbaugh and the lead guitarist of the Nervous Return, Shane Gallagher. According to Hoppus, the band's name refers to the international dialing code of the United Kingdom, the country where Hoppus and Barker first discussed the project.

The band's debut album, When Your Heart Stops Beating, was released on November 14, 2006, entering Billboard's 200 chart at #10 and remaining on the chart for 10 weeks.