Samsung Galaxy S: How the Android flagship smartphone has changed its look
2015's Galaxy S6 added with one hand and took away with the other. The 138g device had a 5.1-inch Quad HD display with 1,440-by-2,560-pixel resolution (577ppi), plus a 16-megapixel rear camera and a 5-megapixel front camera. It supported wireless charging and ran Android 5.0 (Lollipop).
However, the S6 also featured a smaller, non-removable, battery than the previous model, wasn't waterproofed, and did not support external storage expansion via a MicroSD card. On the plus side, switching from a plastic design to metal and glass showed Samsung's desire to take the Galaxy S range upmarket.