Engineering:Samsung Galaxy S21

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Short description: 2021 flagship smartphones by Samsung Electronics
Samsung Galaxy S21 series
From left to right: S21, S21 FE, S21+, and S21 Ultra
BrandSamsung
ManufacturerSamsung Electronics
SeriesGalaxy S
Compatible networks2G, 3G, 4G, 5G
First releasedS21, S21+ and S21 Ultra: January 14, 2021; 5 years ago (2021-01-14)
S21 FE: January 4, 2022; 4 years ago (2022-01-04)
Availability by regionS21, S21+ and S21 Ultra: January 29, 2021; 5 years ago (2021-01-29)
S21 FE: January 7, 2022; 4 years ago (2022-01-07)
DiscontinuedS21, S21+ and S21 Ultra: February 25, 2022; 4 years ago (2022-02-25)
S21 FE: October 3, 2023; 3 years ago (2023-10-03)
PredecessorSamsung Galaxy S20
Samsung Galaxy Note 20 (indirect for S21 Ultra)
SuccessorSamsung Galaxy S22
Samsung Galaxy S23 FE (for S21 FE)
RelatedSamsung Galaxy Z Fold 3
Samsung Galaxy Z Flip 3
TypeS21: Smartphone
S21+, S21 Ultra and S21 FE: Phablet
DimensionsS21: 151.7 × 71.2 × 7.9 mm (5.97 × 2.80 × 0.31 in)
S21+: 161.5 × 75.6 × 7.8 mm (6.36 × 2.98 × 0.31 in)
S21 Ultra: 165.1 × 75.6 × 8.9 mm (6.50 × 2.98 × 0.35 in)
S21 FE: 155.7 × 74.5 × 7.9 mm (6.13 × 2.93 × 0.31 in)
MassS21: 169 g (6.0 oz)
S21+: 200 g (7.1 oz)
S21 Ultra: 227 g (8.0 oz)
S21 FE: 177 g (6.2 oz)
Operating systemS21, S21+ and S21 Ultra:
Original: Android 11 with One UI 3.1
Current: Android 15 with One UI 7
S21 FE:
Original: Android 12 with One UI 4
Current: Android 16 with One UI 8
System on chip
CPUExynos: Octa-core (1x2.9 GHz Cortex-X1, 3x2.80 GHz Cortex-A78 and 4x2.2 GHz Cortex-A55)
Snapdragon: Octa-core (1x2.84 GHz, 3x2.42 GHz and 4x1.80 GHz) Kryo 680
GPUExynos: Mali-G78 MP14
Snapdragon: Adreno 660
MemoryS21 and S21+: 8 GB RAM
S21 Ultra: 12/16 GB RAM
S21 FE 6/8 GB RAM
StorageS21, S21+ and S21 FE: 128/256 GB UFS 3.1
S21 Ultra: 128/256/512 GB UFS 3.1
Removable storageNone
BatteryS21: 4000 mAh Lithium polymer
S21+: 4800 mAh Lithium polymer
S21 Ultra: 5000 mAh Lithium polymer
S21 FE: 4500 mAh Lithium polymer
ChargingUSB PD: 25W (PPS), 15W (non-PPS)
15 W QI wireless
4.5 W Reverse wireless
Data inputsUSB-C 3.2

Sensors:

Display
  • Dynamic AMOLED 2X Infinity-O capacitive touchscreen, 10Hz-120 Hz refresh rate, 20:9 aspect ratio, HDR10+,
    (Diamond PenTile)
  • S21: 6.2 in (160 mm) 2592000 2400 × 1080 (2.5 MP) (421 ppi) 1300 nits
  • S21+: 6.7 in (170 mm) 2592000 2400 × 1080 (394 ppi) 1300 nits
  • S21 Ultra: 6.8 in (170 mm) 4608000 3200 × 1440 (4.6 MP) (515 ppi) 1600 nits
  • S21 FE: 6.4 in (160 mm) 2527200 2340 × 1080 (411 ppi) 1300 nits
External displayAlways on
Rear cameraAll: Features: LED flash, auto-HDR, panorama

Video: 8K@24fps, 4K@30/60fps, 1080p@30/60/120fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS & OIS
S21 and S21+:
12 MP, f/1.8, 26 mm (wide), 1/1.76", 1.8 μm, Dual Pixel PDAF, OIS
64 MP, f/2.0, 28 mm (telephoto), 1/1.76", 0.8 μm, PDAF, OIS, 1.1x optical, 3x hybrid
12 MP, f/2.2, 13 mm 120° (ultrawide), 1/2.55" 1.4 μm, Super Steady video S21 Ultra:
108 MP (2nd gen), f/1.8, 26 mm (wide), 1/1.33", 0.8 μm, PDAF, Laser AF, OIS
10 MP, f/4.9, 240 mm (periscope telephoto), 1/3.24", 1.22 μm, dual pixel PDAF, OIS, 10x optical
10 MP, f/2.4, 70 mm (telephoto), 1/3.24", 1.22 μm, dual pixel PDAF, OIS, 3x optical
12 MP, f/2.2, 13 mm (ultrawide), 1/2.55", 1.4 μm, dual pixel PDAF, Super Steady video

S21 FE:
12 MP, f/1.8, 26 mm (wide), Dual Pixel PDAF, OIS
8 MP, f/2.4, 76 mm (telephoto), 1/1.76", 0.8 μm, PDAF, 3x optical
12 MP, f/2.2, 13 mm 123° (ultrawide)
Front cameraS21 and S21+: 10 MP, f/2.2, 26 mm (wide), 1/3.24", 1.22 μm, Dual Pixel PDAF
S21 Ultra: 40 MP, f/2.2, 26 mm (wide), 1/2.8", 0.7 μm, PDAF
S21 FE: 32 MP, f/2.2, 26 mm (wide), 1/2.74", 0.8 μm, Dual Pixel PDAF
SoundDolby Atmos stereo speakers tuned by AKG
ConnectivityBluetooth 5.2
Wi-Fi 802.11 a/b/g/n/ac/ax(Wi-Fi 6E: S21 Ultra)
Website
References[1][2][3][4]

The Samsung Galaxy S21 is a series of high-end Android-based smartphones developed, marketed, and manufactured by Samsung Electronics as part of its flagship Galaxy S series. They collectively serve as the successor to the Galaxy S20 series. The first three smartphones (Galaxy S21, Galaxy S21+, Galaxy S21 Ultra) were unveiled at Samsung's Galaxy Unpacked event on January 14, 2021,[5][6] while the Galaxy S21 FE was unveiled at Samsung's CES on January 4, 2022.[7][8] The first three phones were released in the United States and Europe on January 29, 2021,[9] while the Fan Edition was released globally on January 7, 2022.[10]

The Galaxy S21 was succeeded by the Galaxy S22, which was announced on February 9, 2022.[11]

Lineup

The line-up consists of four devices: Galaxy S21, Galaxy S21+, Galaxy S21 Ultra,[6] and the Galaxy S21 FE.[8][12] The devices would be the first time since the Galaxy S6 to remove the microSD card slot.[13] The S21 Ultra is the first phone in the Galaxy S series to support the S Pen, albeit sold separately and with limited functionality.[14] It is the last phone of the Galaxy S series to use the former "SM-G9xx" model number format for the flagship device which had been in use since the Galaxy S5 as Samsung started to use the new "SM-S123X" model number format for future flagships starting with the Galaxy S22.[15]

Performance

The S21 line comprises four models with different chipsets used. International and Korean models of the S21 utilize the Exynos 2100 SoC, while the U.S., Canadian, Chinese, Taiwanese, Hong Kong and Japanese models utilize the Qualcomm Snapdragon 888.[16] The U.S., Canadian, Chinese, and international (European) models of the S21 FE use the Snapdragon 888, while Korean, Indian, Brazilian and Australian markets use Exynos 2100.[17]

Design

The Galaxy S21 series has a design similar to its predecessor, with an Infinity-O display containing a circular cutout in the top center for the front selfie camera. The S21 and S21 FE's back panel is reinforced poly-carbonate (plastic) similar to the S20 FE and Note 20, while the S21+ and S21 Ultra use Gorilla Glass Victus.[18] The rear camera array has been integrated into the phone body except for the S21 FE which is made out of reinforced poly-carbonate integrated instead on the back cover and has a metallic surround; the S21 Ultra has a carbon fiber camera surround for exclusive colors.

Galaxy S21 FE Galaxy S21 Galaxy S21+ Galaxy S21 Ultra
Base colors
  • White
  • Graphite
  • Lavender
  • Olive
  • Phantom White
  • Phantom Gray
  • Phantom Violet
  • Phantom Pink
  • Phantom Silver
  • Phantom Black
  • Phantom Violet
  • Phantom Silver
  • Phantom Black
Online exclusive colors N/A N/A
  • Phantom Gold
  • Phantom Red
  • Phantom Titanium
  • Phantom Navy
  • Phantom Brown

Specifications

Hardware

Display

The S21 series features "Dynamic AMOLED 2X" displays with HDR10+ support and "dynamic tone mapping" technology.[19] All models except the S21 FE utilize a second-generation ultrasonic in-screen fingerprint sensor with the latter opting for an optical in-screen system instead. The S21 Ultra is also now able to use 120 Hz at 1440p unlike its predecessor (which was limited to 120 Hz at only 1080p).[20]

Spec Galaxy S21 FE Galaxy S21 Galaxy S21+ Galaxy S21 Ultra
Display size 6.4 in (163 mm) 6.2 in (157 mm) 6.7 in (170 mm) 6.8 in (173 mm)
Resolution 2340×1080 2400×1080 3200×1440
Density ~403 ppi ~421 ppi ~394 ppi ~515 ppi
Aspect ratio 19.5:9 20:9
Refresh rate 60 Hz / 120 Hz 48 Hz to 120 Hz 10 Hz to 120 Hz
Panel Dynamic LTPO AMOLED 2X, HDR10+
Cover glass Gorilla Glass Victus
Ref. [20][21][22][23][24]

Cameras

The S21 and S21+ continue to have a similar camera setup to their predecessors but benefit from improved software and image processing.[25] The S21 FE also have a similar camera setup to its predecessor but benefits from improved software and image processing.[26] The S21 Ultra also carries over the primary rear, ultrawide, and front camera sensors from its predecessor, and introduces two different telephoto sensors.[27] The S21 Ultra also introduces support for 12-bit RAW photo capture,[25] and improvements to slow-motion quality.[28] All devices can record HDR10+ video and support HEIF.[29][30]

Camera comparison on Galaxy S21 Series[20]
Models Galaxy S21 & S21+ Galaxy S21 Ultra Galaxy S21 FE
Wide 12 MP (f/1.8) 108 MP (f/1.8) 12 MP (f/1.8)
Ultrawide 12 MP (120° FOV)
Telephoto 64 MP (3×) (f/2.0) 10 MP (3×) (f/2.4) 8 MP (3×) (f/2.4)
Periscope Telephoto N/A 10 MP (10×) (f/4.9) N/A
Front 10 MP (f/2.2) 40 MP (f/2.2) 32 MP (f/2.2)
Galaxy S21/S21+/S21 Ultra support 8K video recording at up to 24fps[31]
Galaxy S21 FE support 4K video recording at up to 60fps
Moon photo controversy

Users discovered that the Scene Optimizer included with Samsung Galaxy S21 and later phones use artificial intelligence to identify the Moon and add details that the camera is not capable of capturing, based on a library of existing moon photos.[32][33] However, this was disputed by Samsung, claiming that they have an AI enhancement algorithm that adds detail to the moon photos.[33]

Memory and Storage

Model Memory Storage options Storage type
Galaxy S21 8 GB 128 GB / 256 GB UFS 3.1
Galaxy S21+
Galaxy S21 Ultra 12 GB / 16 GB 128 GB / 256 GB / 512 GB
Galaxy S21 FE 6 GB / 8 GB 128 GB / 256 GB
Ref. [34]

The S21 and S21+ offer 8 GB of RAM with 128 and 256 GB options for internal storage. The S21 Ultra has 12 GB of RAM with 128 and 256 GB options as well as a 16 GB option with 512 GB of internal storage. The S21 FE offers 6 and 8 GB of RAM with 128 and 256 GB options for internal storage. All four models lack a microSD card slot, which was present in the S20 series.[35]

Batteries

The S21, S21 FE, S21+, and S21 Ultra contain non-removable 4000 mAh, 4,500 mAh, 4800 mAh, and 5000 mAh batteries respectively.[36] All four models support wired charging over USB-C at up to 25W (using USB Power Delivery) as well as Qi inductive charging up to 15W. The phones also can charge other Qi-compatible devices from the S21's battery power, which is branded as "Wireless PowerShare," at up to 4.5W.[37]

Galaxy S21 FE Galaxy S21 Galaxy S21+ Galaxy S21 Ultra
Battery capacity 4,500 mAh 4,000 mAh 4,800 mAh 5,000 mAh
Wired charging speed 25 W
Qi2 wireless charging speed 15 W
Reverse wireless charging speed 4.5 W
Ref. [36]

Connectivity

All four phones support 5G SA/NSA networks. The Galaxy S21, S21+, and S21 FE support Wi-Fi 6 and Bluetooth 5.0, while the Galaxy S21 Ultra supports Wi-Fi 6E and Bluetooth 5.2. The S21+ and S21 Ultra models also support Ultra Wideband (UWB) for short-range communications similar to NFC (not to be confused with 5G mmWave, which is marketed as Ultra Wideband by Verizon). Samsung uses this technology for their new "SmartThings Find" feature and the Samsung Galaxy SmartTag+.[38]

Model Wi-Fi Bluetooth UWB USB NFC
Galaxy S21 FE Wi-Fi 6 5.0 No USB-C 3.2
(5Gbps) 		Yes
Galaxy S21
Galaxy S21+ Yes
Galaxy S21 Ultra Wi-Fi 6E 5.2
Ref. [6][38]

Software

The first three S21 phones were released with Android 11 (One UI 3.1),[39] while the S21 FE was released with Android 12 (One UI 4).[40] They all use Samsung Knox for enhanced device factory reset protection (FRP) security, and a separate version exist for enterprise use.[41] All of the S21 phones are eligible for four Android OS updates and five years of security updates.[42]

Pre-installed OS OS Upgrades history End of support
1st 2nd 3rd 4th
S21
S21+
S21 Ultra 		Android 11
(One UI 3.1) 		Android 12
(One UI 4.0)
November 2021[43]
(One UI 4.1)
March 2022[44] 		Android 13
(One UI 5.0)
November 2022[45]
(One UI 5.1)
February 2023[46] 		Android 14
(One UI 6.0)
November 2023[47]
(One UI 6.1)
May 2024[48] 		Android 15
(One UI 7.0)
April 2025[49] 		February 2026[50]
S21 FE Android 12
(One UI 4.0) 		Android 13
(One UI 5.0)
November 2022[51]
(One UI 5.1)
February 2023[52] 		Android 14
(One UI 6.0)
December 2023[53]
(One UI 6.1)
May 2024[54] 		Android 15
(One UI 7.0)
May 2025[55] 		Android 16
(One UI 8.0)
October 2025[56] 		Within 2027

Reception

The Verge's review, by Dieter Bohn, praised the S21 Ultra's punchy display, fast performance, long-lasting battery life and the general improvements to the camera system, likening the latter to that of the iPhone 12 Pro Max's; however, Bohn did note that the phone's glass back is slightly more susceptible to minor scratches.[57] Android Authority's review by David Imel noted the Samsung's Galaxy S21 Ultra "is a powerhouse smartphone" and that "the camera system in Samsung Galaxy S21 Ultra is one of the best you can get on Android".[58] Matt Sweder at Techradar gave a positive review noting its "mesmerizing design" calling it "Samsung's best-looking phone ever" and how "phenomenally powerful" the camera is, but also went on to criticize the price and lack of microSD card slot, and questioning the stylus support, which is a separate purchase, with nowhere to put the S Pen on the phone itself.[59]

Criticism has been aimed at the lack of a charger and memory card-expandable storage, the latter of which existed on the preceding Galaxy S20.[60] In 2018, Samsung made fun of iPhone's lack of the same features and an audio connector port in a series of commercials for the Galaxy S9 named "Ingenious", where unhappy iPhone customers confront an Apple Store employee over the lack of functionality that the Galaxy S9 was equipped with, a feature which has since been removed from all Galaxy phones.[61]

Following Apple, Samsung decided not to include a wall charger or earphones when selling the Galaxy S21 series of smartphones, the reasoning being that "Samsung believes the removal of earphones and charger plugs from our in-box device packaging can help address the growing e-waste problem and unnecessary duplication of these items". However, reaching the highest charging rate possibly requires a new charger with separate packaging and shipping with a standalone environmental footprint.[62]

See also

References

  1. ↑ "Samsung Galaxy S21 5G". https://www.gsmarena.com/samsung_galaxy_s21_5g-10626.php. 
  2. ↑ "Samsung Galaxy S21+ 5G". https://www.gsmarena.com/samsung_galaxy_s21+_5g-10625.php. 
  3. ↑ "Samsung Galaxy S21 Ultra 5G". https://www.gsmarena.com/samsung_galaxy_s21_ultra_5g-10596.php. 
  4. ↑ "Samsung Galaxy S21 FE 5G". https://gsmarena.com/samsung_galaxy_s21_fe_5g-10954.php. 
  5. ↑ Gartenberg, Chaim (14 January 2021). "Samsung Galaxy S21, S21 Plus, and S21 Ultra First Look: Polished Design (and prices)". The Verge. https://www.theverge.com/22227772/samsung-galaxy-s21-plus-ultra-price-specs-release-date-unpacked. 
  6. ↑ 6.0 6.1 6.2 Huseman, Hayato (2021-01-14). "Samsung Galaxy S21 series is official with better cameras, S Pen support, and lower prices for 2021" (in en). https://www.androidcentral.com/samsung-galaxy-s21-announcement. 
  7. ↑ "The Galaxy S21 FE is Samsung's new affordable phone — here's our CES 2022 hands-on" (in en). 4 January 2022. https://us.cnn.com/2022/01/04/cnn-underscored/samsung-galaxy-s21-fe-ces-2022/index.html. 
  8. ↑ 8.0 8.1 "Samsung finally launches the much-leaked Galaxy S21 FE" (in English). 2022-01-04. https://www.techadvisor.com/article/745481/samsung-finally-launches-the-much-leaked-galaxy-s21-fe.html. 
  9. ↑ "Samsung's Galaxy S21 is official: Release date, price, features, specs and everything else you need to know" (in en). 2021-01-14. https://www.zdnet.com/article/samsungs-galaxy-s21-is-official-release-date-price-features-specs-and-everything-else-you-need-to-know/. 
  10. ↑ "CES 2022: Samsung Galaxy S21 FE revealed with flagship features and affordable price" (in en). 2022-01-04. https://www.zdnet.com/article/ces-2022-samsung-galaxy-s21-fe-revealed-with-flagship-features-and-affordable-price/. 
  11. ↑ Sohn, Jiyoung (2022-02-09). "Samsung Unveils New Galaxy S22 Smartphones and Keeps Old Prices" (in en-US). Wall Street Journal. ISSN 0099-9660. https://www.wsj.com/articles/samsung-unveils-new-galaxy-s22-smartphones-and-keeps-old-prices-11644418801. 
  12. ↑ Priday, Richard (14 January 2021). "Samsung Galaxy S21 vs Galaxy S21 Plus vs Galaxy S21 Ultra: What's different?". https://www.tomsguide.com/news/samsung-galaxy-s21-vs-galaxy-s21-plus-vs-galaxy-s21-ultra-all-the-differences. 
  13. ↑ Blumenthal, Eli (2021-01-14). "Samsung is ditching the microSD card slot on the Galaxy S21 line - CNET" (in en-US). https://www.cnet.com/tech/mobile/samsung-is-ditching-the-microsd-card-slot-on-the-galaxy-s21line/. 
  14. ↑ Cipriani, Jason (14 January 2021). "Galaxy S21 Ultra works with Samsung S Pen, Pro stylus: Price, features and limitations". CNET. https://www.cnet.com/how-to/galaxy-s21-ultra-works-with-samsung-s-pen-pro-stylus-price-features-limitations-more/. 
  15. ↑ Rathore, Yash (2021-07-26). "Samsung to finally end S series’ confusing model numbers with Galaxy S22" (in en-US). https://www.sammyfans.com/2021/07/26/samsung-to-finally-end-s-series-confusing-model-numbers-with-galaxy-s22/. 
  16. ↑ Spoonauer, Mark (17 January 2021). "Samsung Galaxy S21 Ultra review (hands on)". https://www.tomsguide.com/reviews/samsung-galaxy-s21-ultra. 
  17. ↑ Ravichandran, Sudarshan (2022-01-04). "Galaxy S21 FE: Europe gets Snapdragon 888, Exynos 2100 in Asia" (in en-US). https://www.gizmochina.com/2022/01/04/galaxy-s21-fe-europe-gets-snapdragon-888-exynos-2100-in-asia/. 
  18. ↑ Schoon, Ben (14 January 2021). "Galaxy S21 unboxing and first impressions: No charger, but a whole lot of phone [Video"]. https://9to5google.com/2021/01/14/samsung-galaxy-s21-unboxing-impressions/. 
  19. ↑ "Samsung Galaxy S21, S21+, S21 Ultra review: Distilled excellence" (in en-SG). 2021-01-21. https://www.hardwarezone.com.sg/mobile/smartphones/feature-samsung-galaxy-s21-galaxy-s21-ultra-review-features-performance-price-distilled-excellence. 
  20. ↑ 20.0 20.1 20.2 "Specs | Samsung Galaxy S21 5G vs S21+ 5G vs S21 Ultra 5G" (in en). https://www.samsung.com/global/galaxy/galaxy-s21-ultra-5g/specs/. 
  21. ↑ "Galaxy S21 Official Specifications" (in en). https://www.samsungmobilepress.com/media-assets/galaxy_s21/specs. 
  22. ↑ "Galaxy S21+ Official Specifications" (in en). https://www.samsungmobilepress.com/media-assets/galaxy_s21_plus/specs. 
  23. ↑ "Galaxy S21 Ultra Official Specifications" (in en). https://www.samsungmobilepress.com/media-assets/galaxy-s21-ultra/specs. 
  24. ↑ "Galaxy S21 FE 5G Official Specifications" (in en). https://www.samsungmobilepress.com/media-assets/galaxy_s21_fe_5g/specs. 
  25. ↑ 25.0 25.1 Khanna, Prakhar (2021-01-22). "Explained: Everything that’s new in the Galaxy S21 cameras" (in en). https://pocketnow.com/galaxy-s21-cameras/. 
  26. ↑ Mishra, Abhijeet (2022-01-04). "The best Samsung Galaxy S21 FE features you need to know about" (in en-US). https://www.sammobile.com/samsung/best-samsung-galaxy-s21-fe-features/. 
  27. ↑ Gibbs, Samuel (21 January 2021). "Samsung Galaxy S21 Ultra review: the new king of Android phones". The Guardian. https://www.theguardian.com/technology/2021/jan/21/samsung-galaxy-s21-ultra-review-the-new-king-of-android-phones. 
  28. ↑ "Galaxy S21 Slow Motion Feature is Retained!" (in en-US). 18 January 2021. https://www.hispeedcams.com/galaxy-s21-slow-motion-feature-is-retained/. 
  29. ↑ "How advanced A.I. and new hardware push the Galaxy S21 Ultra's camera forward". 18 January 2021. https://www.digitaltrends.com/mobile/how-samsung-improved-galaxy-s21-ultra-camera-ai-hardware/. 
  30. ↑ "The Galaxy S21 and S21 Plus do at least one thing better than the Ultra" (in en-US). 19 January 2021. https://www.androidauthority.com/samsung-galaxy-s21-ultra-960fps-1194042/. 
  31. ↑ "The Galaxy S21 Camera Shoots 8K Video & Turns It Into Photos". 14 January 2021. https://www.androidheadlines.com/2021/01/samsung-galaxy-s21-8k-video-snap-photos-features-android-smartphones.html. 
  32. ↑ Fingas, Jon (15 March 2023). "Samsung explains its 'fake' Moon photos". Engadget. https://www.engadget.com/samsung-explains-its-fake-moon-photos-170233896.html. 
  33. ↑ 33.0 33.1 Porter, Jon (15 March 2023). "Samsung responds to fake Moon controversy". https://www.theverge.com/2023/3/15/23641069/samsung-fake-moon-controversy-english-language-blog-post. 
  34. ↑ Carrasqueira, João (2022-02-12). "Does the Samsung Galaxy S22 series have a microSD card slot?" (in en). https://www.xda-developers.com/samsung-galaxy-s22-microsd/. "Most common microSD cards offer maximum bus speeds of around 100MB/s, which is a big step down from the 2900MB/s of bandwidth in UFS 3.1, which is the storage standard used in the Galaxy S22 series." 
  35. ↑ Chin, Monica (14 January 2021). "Samsung's Galaxy S21 phones don't include microSD card support". The Verge. https://www.theverge.com/2021/1/14/22230868/samsung-galaxy-s21-storage-microsd-support-slot. 
  36. ↑ 36.0 36.1 Hoyle, Andrew (14 January 2021). "Samsung Galaxy S21: What to know about battery life and battery sizes". CNET. https://www.cnet.com/news/samsung-galaxy-s21-what-to-know-about-battery-size-battery-life/. 
  37. ↑ "Samsung Galaxy S21 Ultra 5G – Full phone specifications". https://www.gsmarena.com/samsung_galaxy_s21_ultra_5g-10596.php. 
  38. ↑ 38.0 38.1 SamMobile (18 January 2021). "What is UWB and why should Galaxy S21+/S21 Ultra owners care?" (in en-US). https://www.sammobile.com/news/uwb-explained-galaxy-s21-plus-s21-ultra. 
  39. ↑ "Samsung's Galaxy S21 is official: Release date, price, features, specs and everything else you need to know" (in en). 2021-01-14. https://www.zdnet.com/article/samsungs-galaxy-s21-is-official-release-date-price-features-specs-and-everything-else-you-need-to-know/. 
  40. ↑ Ivan (2022-01-03). "Samsung Galaxy S21 FE 5G is finally here with SD888, Android 12" (in en-US). https://www.gsmarena.com/samsung_galaxy_s21_fe_5g_is_everything_we_expected_on_sale_january_11_for_749_-news-52487.php. 
  41. ↑ Moorhead, Patrick. "What's New With Samsung Smartphone Security" (in en). https://www.forbes.com/sites/patrickmoorhead/2021/03/16/whats-new-with-samsung-smartphone-security/. 
  42. ↑ "Samsung Sets the New Standard With Four Generations of OS Upgrades To Ensure the Most Up-to-Date and More Secure Galaxy Experience". Samsung. 10 February 2022. https://news.samsung.com/global/samsung-sets-the-new-standard-with-four-generations-of-os-upgrades-to-ensure-the-most-up-to-date-and-more-secure-galaxy-experience. Retrieved 23 September 2025. 
  43. ↑ Matei, Mihai (2021-11-15). "Galaxy S21 series One UI 4.0 update now rolling out globally!" (in en-US). https://www.sammobile.com/news/galaxy-s21-series-one-ui-4-0-update-rolling-out-globally/. 
  44. ↑ Matei, Mihai (2022-03-17). "The day just got better for Galaxy S21 fans: One UI 4.1 update is live" (in en-US). https://www.sammobile.com/news/the-day-just-got-better-for-galaxy-s21-fans-one-ui-4-1-update-is-live/. 
  45. ↑ Mishra, Abhijeet (2022-11-07). "BREAKING: Public Galaxy S21 Android 13 and One UI 5.0 update is out!" (in en-US). https://www.sammobile.com/news/public-galaxy-s21-android-13-and-one-ui-5-0-update-is-out/. 
  46. ↑ Shaik, Asif Iqbal (2023-02-13). "Galaxy S21 gets treated with One UI 5.1 update" (in en-US). https://www.sammobile.com/news/galaxy-s21-one-ui-5-1-update-released/. 
  47. ↑ Shaik, Asif Iqbal (2023-11-24). "Galaxy S21 gets stable Android 14 update" (in en-US). https://www.sammobile.com/news/galaxy-s21-stable-android-14-update-released-europe/. 
  48. ↑ Mishra, Abhijeet (2024-05-02). "Galaxy S21 series getting the One UI 6.1 update!" (in en-US). https://www.sammobile.com/news/samsung-galaxy-s21-one-ui-6-1-update/. 
  49. ↑ Matei, Mihai (2025-04-29). "Galaxy S21 gets its last OS update, One UI 7, ahead of schedule" (in en-US). https://www.sammobile.com/news/galaxy-s21-gets-its-last-os-update-one-ui-7-ahead-of-schedule/. 
  50. ↑ Shaik, Asif Iqbal (2026-02-03). "Samsung will not release software updates to the Galaxy S21 anymore" (in en-US). https://www.sammobile.com/news/galaxy-s21-plus-ultra-software-updates-stopped/. 
  51. ↑ Matei, Mihai (2022-11-21). "BREAKING: One UI 5.0 update is available for Galaxy S21 FE" (in en-US). https://www.sammobile.com/news/one-ui-5-0-update-available-for-galaxy-s21-fe/. 
  52. ↑ Shaik, Asif Iqbal (2023-02-27). "Galaxy S21 FE gets many new features with One UI 5.1 update" (in en-US). https://www.sammobile.com/news/galaxy-s21-fe-one-ui-5-1-update-released/. 
  53. ↑ Shaik, Asif Iqbal (2023-12-05). "Galaxy S21 FE bags Android 14 and One UI 6.0 update in the US" (in en-US). https://www.sammobile.com/news/galaxy-s21-fe-android-14-one-ui-6-0-update-usa-carrier-locked/. 
  54. ↑ Mishra, Abhijeet (2024-05-12). "Fan Edition Galaxy S21 joins the One UI 6.1 party!" (in en-US). https://www.sammobile.com/news/samsung-galaxy-s21-fe-one-ui-6-1-usa/. 
  55. ↑ Shaik, Asif Iqbal (2025-05-13). "One UI 7 rolling out for Galaxy S21 FE in Europe, Asia" (in en-US). https://www.sammobile.com/news/galaxy-s21-fe-one-ui-7-update-released-europe-asia/. 
  56. ↑ Shaik, Asif Iqbal (2025-10-23). "Galaxy S21 FE starts getting its last major One UI update" (in en-US). https://www.sammobile.com/news/galaxy-s21-fe-last-major-one-ui-update-released/. 
  57. ↑ Bohn, Dieter (21 January 2021). "Samsung Galaxy S21 Ultra review: the real deal" (in en). https://www.theverge.com/22241506/samsung-galaxy-s21-ultra-review-camera-price. 
  58. ↑ "Samsung Galaxy S21 Ultra review: Ultra refined" (in en-US). 2021-03-01. https://www.androidauthority.com/samsung-galaxy-s21-ultra-review-1192508/. 
  59. ↑ January 2021, Matt Swider 29. "Samsung Galaxy S21 Ultra review" (in en). https://www.techradar.com/reviews/samsung-galaxy-s21-ultra-review. 
  60. ↑ Schoon, Ben (14 January 2021). "Samsung ditches microSD cards in Galaxy S21 series". https://9to5google.com/2021/01/14/samsung-microsd-card-support-galaxy-s21/. 
  61. ↑ "Samsung Pokes Fun at Apple Store Employees With New Galaxy S9 'Ingenious' Ads". 23 July 2018. https://hypebeast.com/2018/7/samsung-ingenious-apple-ads. 
  62. ↑ "Why isn't Samsung including earphones and a charger plug in the box?" (in en-GB). https://www.samsung.com/uk/support/mobile-devices/why-does-samsung-not-include-a-charger-in-the-box/. 
Preceded by
Samsung Galaxy S20 		Samsung Galaxy S21
2021 		Succeeded by
Samsung Galaxy S22



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