“Iranian President Hassan Rouhani was on his way to John F. Kennedy International Airport in New York about 2:30 p.m. Friday when the phone rang in his car. President Obama was on the line from the Oval Office, and the two men spoke for 15 minutes, ending a decades-long diplomatic freeze. No U.S. leader had spoken with an Iranian president since the Islamic revolution ousted the U.S.-backed shah in 1979.”
Source: Obama, Iranian president speak by phone – The Washington Post