For folks who are interested in knowing when s7 was released, here is the sort answer: March 11, 2016.
Samsung s7 was officially unveiled on February 21, 2016 during a Samsung press conference at Mobile World Congress, with a European and North American release on March 11 2016. As with the S6, S7 is manufactured in a standard model with a display size of 5.1 inches, as well as an Edge variant whose 5.5-inch display is curved along the wide sides of the screen.