Both phones have a Dual Aperture rear camera which can switch between f/1.5 and f/2.4, depending on lighting conditions, making it the first mobile phone since the Nokia N86 (2009) with a variable aperture camera. The S9+ has a dual-lens camera setup on the back, like on the Galaxy Note 8, while the S9 only has a single camera on the back. The cameras on both phones received improvements. The displays have curved sides that slope over the horizontal edges of the device. The S9 has a 5.8-inch panel, while the S9+ uses a larger 6.2-inch panel. They both feature 1440p Super AMOLED displays, with an 18.5:9 aspect ratio. On the front, the Galaxy S9 and S9+ look identical to the S8 and S8+. Many Galaxy S9 features and design changes were leaked weeks before the official launch, and the official launch video was leaked a few hours prior to the unveiling.

It was succeeded by the Samsung Galaxy S10 in March 2019. It is available in seven colours (Lilac Purple, Midnight Black, Titanium Gray, Coral Blue, Sunrise Gold, Burgundy Red, and Polaris Blue). Critics, however, still criticize the lack of improvement to other features compared to its predecessor. The phone received generally favorable reviews, with critics mostly noting the enhanced camera and better positioned fingerprint scanner. Most notably, however, the S9 line is equipped with several camera improvements over the S8. While the S8's is found beside the camera, the S9's is directly underneath it. One highly regarded change to distinguish between the models is the location of the fingerprint sensor.

The Galaxy S9 and S9+ have nearly identical features to the S8 models, with the same display sizes and aspect ratio as their predecessors. The devices were revealed at the Mobile World Congress in Barcelona on 25 February 2018, as the successors to the Samsung Galaxy S8 and S8+. The Samsung Galaxy S9 and S9+ are Android-based smartphones unveiled, manufactured, released and marketed by Samsung Electronics as part of the Samsung Galaxy S series. Wi-Fi 802.11 a/b/g/n/ac (2.4/5 GHz), VHT80, MU-MIMO, 1024-QAMīluetooth 5.0 (LE up to 2Mbit/s), ANT+, USB-C, 3.5mm headphone jack, NFC, location ( GPS, Galileo, GLONASS, BeiDou) Stereo speakers tuned by AKG, Dolby Atmos surround sound Sony IMX320 Samsung Isocell S5K31 8 MP ( 1.22 μm, f/1.7), autofocus S9: Sony IMX345 Samsung Isocell S5K2元 12 MP ( 1.4 μm, f/1.5/2.4), OIS, 4K at 30 or 60 fps (limited to 5 min), QHD at 30 fps, 1080p at 30 or 60 fps, 720p at 30 and super slow motion at 960 fps (for 0.2 seconds).

2960×1440 1440p Super AMOLED capacitive touchscreen Infinity Display.

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