The Samsung Galaxy S9 and S9+ are Android-based smartphones unveiled, manufactured, released and marketed by Samsung Electronics as part of the Galaxy S series. The devices were revealed at the Mobile World Congress in Barcelona on 25 February 2018, as the successors to the Galaxy S8 and S8+. It is the last Galaxy S series line to only have 4G network support, which was commercially released on 16 March 2018. It is also the last Galaxy S series line to feature an iris scanner, a variable-aperture lens, and a notification light.