Samsung Electronics America today announced that 500,000 replacement Galaxy Note7 smartphones have been shipped to carrier and retail stores in the United States. The replacement devices will be made available starting September 21 to people who previously bought the Galaxy Note7 and need to exchange it for one with a known-safe battery. Further, Samsung plans to push a software update to all Note7s to help consumers identify safe devices from those that still might pose a fire risk. Once updated, new/safe Note7 units will display a green battery icon on the status bar found on the top right hand of the screen. Samsung and the U.S. CPSC urge everyone who bought a Note7 before September 15 to power down their device. A software update will be pushed to all recalled devices that will prompt owners with a safety notice urging them to turn the phone off and and exchange it. The notice will appear every time Note7 owners power up or charge their impacted phone. Note7 owners can visit Samsung's web site for more information