| Hardware and OS | Samsung Galaxy S21 Plus | |
| Operating system | Android v11 | |
| Processor | Samsung Exynos 2100 | |
| RAM | 8 GB | |
| Internal Storage | 128 GB | |
| Custom UI | Samsung One UI | |
| Display | Samsung Galaxy S21 Plus | other phones |
| Type | Dynamic AMOLED | |
| Size | 6.7 inches | |
| Resolution | 1080 x 2400 Pixels | |
| Pixel Density | 393 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Protection | Corning Gorilla Glass | |
| Aspect ratio | 20:9 | |
| Refresh rate | 120 Hz | |
| Screen to body ratio calculated | 88.77 % | |
| Connectivity | Samsung Galaxy S21 Plus | other phones |
| Network support | 5G , 4G , 3G, 2G | |
| WI-FI | Yes, Wi-Fi 802.11, a/ac/b/g/n/n 5GHz | |
| Gps | Yes, with A-GPS, Glonass | |
| Bluetooth | Yes, v5.1 | |
| NFC | Yes | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB TYPE-C | Yes | |
| USB connectivity | Mass storage device, USB charging | |
| Wireless Charging | Yes | |
| Camera | Samsung Galaxy S21 Plus | other phones |
| Image | 4000 x 3000 Pixels | |
| Front camera resolution | 10 MP f/2.2, Wide Angle Primary Camera | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, LED Flash | |
| Autofocus | Yes, Phase Detection autofocus, Dual Pixel autofocus | |
| Aperture | F2.2 | |
| Optical image stabilisation | Yes | |
| Video recording | 3840x2160 @ 30 fps | |
| Multimedia | Samsung Galaxy S21 Plus | other phones |
| Audio jack | USB Type-C | |
| Loudspeaker | Yes | |
| Design | Samsung Galaxy S21 Plus | other phones |
| Height | 161.4 mm | |
| Width | 75.6 mm | |
| Thickness | 7.8 mm | |
| Weight | 202 grams | |
| Colours | Phantom Silver, Phantom Black, Phantom Violet | |
| Ruggedness | Dust Proof | |
| Waterproof | Yes, Water resistant (up to 30 minutes in a depth of 1.5 meter), IP68 | |
| Battery | Samsung Galaxy S21 Plus | other phones |
| Capacity | 4800 mAh | |
| Type | Lithium-ion | |
| User replaceable | No | |
| Quick charging | Yes, Fast, 25W | |
| Other | Samsung Galaxy S21 Plus | other phones |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | On-Screen | |
| Other sensors | Accelerometer, Gyro, Proximity, Compass, Barometer | |
