Samsung Galaxy S5 

The design of the S5 evolves upon the design of the S4. It features a rounded, polycarbonate chassis carrying a "modern glam" look, faux metal trim and a removable rear cover. Unlike past models, the S5's rear cover uses a higher quality soft plastic and is dimpled to improve grip.
Samsung Galaxy S5

Samsung Galaxy S4

First unveiled on March 14, 2013 at Samsung Mobile Unpacked in New York City, it is a successor to the Galaxy S III which maintains a similar design, but with upgraded hardware and an increased focus on software features that take advantage of its hardware capabilities—such as the ability to detect when a finger is hovered over the screen, and expanded eye tracking functionality. 
Samsung Galaxy S4

Samsung Galaxy S3 

Following an 18-month development phase, Samsung unveiled the S III on 3 May 2012. The device was released in 28 European and Middle Eastern countries on 29 May 2012, before being progressively released in other major markets in June 2012. Prior to release, 9 million pre-orders were placed by more than 100 carriers globally.
Samsung Galaxy S3

Samsung Galaxy Note 3

The Samsung Galaxy Note 3 is an Android phablet smartphone produced by Samsung Electronics. The Galaxy Note 3 was unveiled during a Samsung press conference at IFA Berlin on September 4, 2013, with its worldwide release beginning later in the month. Serving as a successor to the Galaxy Note II, the Note 3 was designed to have a lighter, more upscale design than previous iterations of the Galaxy Note series.
Samsung Galaxy Note 3

Samsung Galaxy Note 2

The Samsung Galaxy Note II is an Android phablet smartphone. Unveiled on August 29, 2012 and released in late-2012, the Galaxy Note II is a successor to the original Galaxy Note, incorporating improved stylus functionality, a larger 5.5-inch (140 mm) screen, and an updated hardware design based on that of the Galaxy S III.
Samsung Galaxy Note 2