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Samsung Galaxy S21

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The Samsung Galaxy S21 is a series of high-end Android-based smartphones developed, marketed, and manufactured by Samsung Electronics as part of its Galaxy S series. They collectively serve as the successor to the Samsung Galaxy S20 series. The first three smartphones were unveiled at Samsung's Galaxy Unpacked event on 14 January 2021, while the Fan Edition model was unveiled at Samsung's CES on 3 January 2022.

Samsung Galaxy S21
Samsung Galaxy S21+
Samsung Galaxy S21 Ultra
Samsung Galaxy S21 FE
From left to right S21, S21 FE, S21+, and S21 Ultra.
BrandSamsung
ManufacturerSamsung Electronics
TypeS21: Smartphone S21+/S21 Ultra: Phablet
SeriesGalaxy S
First releasedJanuary 14, 2021; 3 years ago (2021-01-14) (S21, S21+, and S21 Ultra)
January 3, 2022; 2 years ago (2022-01-03) (S21 FE)
Availability by regionJanuary 29, 2021; 3 years ago (2021-01-29) (S21, S21+, and S21 Ultra)
January 7, 2022; 2 years ago (2022-01-07) (S21 FE)
DiscontinuedFebruary 25, 2022; 2 years ago (2022-02-25)
Units shipped25.5 million
PredecessorSamsung Galaxy S20
SuccessorSamsung Galaxy S22
Compatible networks2G, 3G, 4G, 5G
Form factorSlate
Dimensions
  • S21: 151.7 mm (5.97 in) H
    71.2 mm (2.80 in) W
    7.9 mm (0.31 in) D
  • S21 FE: 155.7 mm (6.13 in) H
    74.5 mm (2.93 in) W
    7.9 mm (0.31 in) D
  • S21+: 161.5 mm (6.36 in) H
    75.6 mm (2.98 in) W
    7.8 mm (0.31 in) D
  • S21 Ultra: 165.1 mm (6.50 in) H
    75.6 mm (2.98 in) W
8.9 mm (0.35 in) D
Weight
  • S21: 169 g (6.0 oz)
  • S21 FE: 177 g (6.2 oz)
  • S21+: 200 g (7.1 oz)
  • S21 Ultra: 227 g (8.0 oz)
Operating system
System-on-chip
CPU
GPU
Memory
  • S21 FE 6/8 GB RAM
  • S21/S21+: 8 GB RAM
  • S21 Ultra: 12/16 GB RAM
Storage
  • S21/S21+/S21 FE: 128/256 GB UFS 3.1
  • S21 Ultra: 128/256/512 GB UFS 3.1
Removable storageNone
SIMnanoSIM, eSIM
Single SIM or Hybrid Dual SIM in dual stand-by
Battery
  • S21: 4000 mAh Lithium polymer
  • S21 FE: 4500 mAh Lithium polymer
  • S21+: 4800 mAh Lithium polymer
  • S21 Ultra: 5000 mAh Lithium polymer
Charging
  • USB PD: 25W (PPS), 15W (non-PPS)
  • 15 W QI wireless
  • 4.5 W Reverse wireless
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 FE:


S21 and S21+:

  • 64 MP, f/1.8, 26 mm (wide), 1/1.76", 1.8 μm, Dual Pixel PDAF, OIS
  • 12 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
Front camera
  • S21 and S21+: 10 MP, f/2.2, 26 mm (wide), 1/3.24", 1.22 μm, Dual Pixel PDAF
  • S21 FE: 32 MP, f/2.2, 26 mm (wide), 1/2.74", 0.8 μm, Dual Pixel PDAF
  • S21 Ultra: 40 MP, f/2.2, 26 mm (wide), 1/2.8", 0.7 μm, PDAF
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) 2400 × 1080 (2.5 MP) (421 ppi) 1300 nits
  • S21 FE: 6.4 in (160 mm) 2340 × 1080 (411 ppi) 1300 nits
  • S21+: 6.7 in (170 mm) 2400 × 1080 (394 ppi) 1300 nits
  • S21 Ultra: 6.8 in (170 mm) 3200 × 1440 (4.6 MP) (515 ppi) 1600 nits
External displayAlways on
SoundDolby Atmos stereo speakers tuned by AKG
Connectivity
Data inputsUSB-C 3.2

Sensors:

Water resistanceIP68 water/dust resistance, up to 1.5 m for 30 minutes
Website
References[1][2][3][4]

The S21 series consists of the base Galaxy S21 model, the larger Galaxy S21+ model, the high-end Galaxy S21 Ultra model, and the mid-range Galaxy S21 FE model. Key upgrades over the previous models, in addition to improved specifications, a display with a 120 Hz adaptive refresh rate, an improved camera system supporting 8K video recording (7680×4320) for the first three models, and a super-resolution zoom of 30–100x, for the ultra model.

The first three phones were released in the United States and Europe on 29 January 2021, while the Fan Edition was released globally on 7 January 2022. The Galaxy S21 FE, S21, S21+, and S21 Ultra launch prices started at $699.99, $799.99, $999.99, and $1079.99, respectively.

The Galaxy S21 was succeeded by the Galaxy S22, which was announced on 9 February 2022.[5]

History

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S21, S21+, and S21 Ultra

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The lineup of the first three devices was unveiled at Samsung's Galaxy Unpacked event on 14 January 2021. The three devices served as the successors of the 2020 models. All devices' design scheme has changed drastically, redesigning the massive rear-camera module for a slimmer camera module incorporated with the buttons and a uniform appearance for the S21, S21+, and S21 Ultra. The base model possesses a (plastic) polycarbonate back, the only model of the three devices to attain the change. The base model attains similar specifications to the S20.[1] The S21+ retains the specifications and design of the regular S21, in contrast to minor differences. It serves as the successor to the S20+.[2] The S21 Ultra serves as the high-end model of the S21 series, integrated as the professional version of the lineup, and successor to the S20 Ultra. The phone became the first of the S-Series lineup to have S-Pen support, with limited functionality.[3] The S21 series discontinued sales once the Galaxy S22 were released.[6] The phones were released on 29 January 2021.[7]

S21 FE

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The "Fan Edition" follow-up was unveiled at Samsung's CES 2022 event on 3 January 2022. The S21 FE serves as the successor to the S20 FE, a series of mid-range variants of their corresponding Galaxy S lineup upon launch. The Fan Edition maintains the majority of the specifications and design of the S21, with slight discrepancies to meet its lower price value.[8] The phone was originally planned to be released in October 2021 but was delayed due to the 2020–present global chip shortage. The S21 FE was released on 11 January 2022.[9] Its battery had 4500mAh (25W wired and 15W wireless). It was also equipped with a 6.4" 1080x2340 display which included under display fingerprint. [10]

Lineup

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The lineup comprises four devices, with the Galaxy S21 initially being the least expensive with a smaller screen size and a polycarbonate (plastic) back, which then is undercut later on by the Galaxy S21 FE with the same material minus the camera bump being also polycarbonate than metal. In contrast to the Galaxy S20+, the Galaxy S21+ is very similar to the S21 spec-wise, with the exception of a larger display, higher battery capacity, and glass back instead of plastic. The Galaxy S21 Ultra has an even larger screen size, battery, and a host of other improvements over the other models, including a more advanced camera setup highlighted by its 108 MP main sensor with laser auto-focus and a higher resolution 1440p display.[11] The S21 Ultra is also the first phone in the Galaxy S series to support the S Pen, albeit sold separately and with limited functionality.[12]

Design

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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.[13] 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 Galaxy S21+ Galaxy S21 Ultra Galaxy S21 FE
Color Name Online exclusive Color Name Online exclusive Color Name Online exclusive Color Name Online exclusive
Phantom White   Phantom Silver   Phantom Silver   White  
Phantom Gray   Phantom Black   Phantom Black   Graphite  
Phantom Violet   Phantom Violet   Phantom Titanium   Lavender  
Phantom Pink   Phantom Gold   Phantom Navy   Olive  
Phantom Red   Phantom Brown  

Specifications

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Hardware

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Chipsets (SoC)

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The S21 line comprises four models with various hardware specifications. 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.[14] 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.

Display

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The S21 series features "Dynamic AMOLED 2X" displays with HDR10+ support and "dynamic tone mapping" technology. 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).[15]

Model Display size (in) Display resolution[15] Max refresh rate Variable refresh rate Shape
S21 6.2 2400x1080 120 Hz 48 Hz to 120 Hz Flat sides
S21 FE 6.4 2340x1080 120 Hz 60 Hz /120 Hz Flat sides
S21+ 6.7 2400x1080 120 Hz 48 Hz to 120 Hz Flat sides
S21 Ultra 6.8 3200x1440 120 Hz 10 Hz to 120 Hz Curved sides

Storage

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Models Galaxy S21 Galaxy S21+ Galaxy S21 Ultra[15] Galaxy S21 FE
RAM Storage RAM Storage RAM Storage RAM Storage
Variant 1 8GB 128GB 8GB 128GB 12GB 128GB 6GB 128GB
Variant 2 8GB 256GB 8GB 256GB 12GB 256GB 8GB 128GB
Variant 3 - - - - 16GB 512GB 8GB 256GB

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

Batteries

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The S21, S21 FE, S21+, and S21 Ultra contain non-removable 4000 mAh, 4,500 mAh, 4800 mAh, and 5000 mAh batteries respectively.[17] 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.[18]

Connectivity

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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+.[19]

Cameras

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Camera comparison on Galaxy S21 Series[15]
Models Galaxy S21 & S21+ Galaxy S21 Ultra Galaxy S21 FE
Wide Specs 12 MP, f/1.8, 26 mm, 1/1.76", DPAF, OIS 108 MP, f/1.8, 24 mm, 1/1.33", PDAF, OIS 12 MP, f/1.8, 26 mm, 1/1.76", Dual PDAF, OIS
Model Samsung S5K2LD or Sony IMX555 Samsung S5KHM3 Samsung S5K2LD or Sony IMX555
Ultrawide Specs 12 MP, f/2.2, 13 mm, 1/2.55", fixed focus 12 MP, f/2.2, 13 mm, 1/2.55", DPAF 12 MP, f/2.2, 15 mm, 1/3.1", Fixed Focus
Model Samsung S5K2LA Sony IMX563 Samsung S5K3L6
Telephoto Specs 64 MP, f/2.0, 29 mm, 1/1.72", PDAF, OIS 10 MP, f/2.4, 70 mm, 1/3.24", DPAF, OIS 8 MP, f/2.4, 76 mm, 1/4.5", PDAF, OIS (3x zoom)
Model Samsung S5KGW2 Samsung S5K3J1 SK Hynix HI-847
Periscope Telephoto Specs - 10 MP, f/4.9, 240 mm, 1/3.24", DPAF, OIS -
Model Samsung S5K3J1
Front Specs 10 MP, f/2.2, 26 mm, 1/3.24", DPAF 40 MP, f/2.2, 26 mm, 1/2.8", PDAF 32 MP, f/2.2, 26 mm, 1/2.74", Fixed Focus
Model Sony IMX374 Samsung S5KGH1 Sony IMX616

The S21 and S21+ have similar camera setups to their predecessors but benefit from improved software and image processing. Both have a 12 MP wide sensor, a 64 MP telephoto sensor with 3x hybrid zoom, and a 12 MP ultrawide sensor. The S21 FE also has a similar camera setup to its predecessor but benefits from improved software and image processing. It has a 12 MP wide sensor, an 8 MP telephoto sensor with 3x optical zoom, and a 12 MP ultrawide sensor. The S21 Ultra has a new HM3 108 MP sensor with several enhancements over the previous HM1 108 MP sensor, including 12-bit HDR. It also has two 10 MP telephoto sensors with 3x and 10x optical zoom and a 12 MP ultrawide sensor.[20] The front-facing camera uses a 10 MP sensor on the S21 and S21+, 32 MP sensor on the S21 FE, and a 40 MP sensor on the S21 Ultra. 4K@60 recording is supported on the ultrawide camera on the S21, S21+, and S21 FE and all cameras on the S21 Ultra. All cameras are Samsung except 12MP Ultra Wide on S21 Ultra and 10MP front on S21 and S21+, which are both made by Sony, and the 8MP Telephoto on the S21 FE which is made by SK Hynix.

The Galaxy S21 series can record HDR10+ video and support HEIF.[15]

Moon photo controversy
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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.[21][22] However, this was disputed by Samsung, claiming that they have an AI enhancement algorithm that adds detail to your moon photos.[22]

Supported video modes
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The Samsung Galaxy S21 series supports the following video modes:[15]

Still frames extracted from high-resolution footage can act as standalone photographs.[26]

Software

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The first three S21 phones were released with Android 11 (One UI 3.1) and Google Mobile Services, with Samsung's One UI software. While the S21 FE was supposed to be released with the same Android version and One UI skin, due to it being delayed all devices are now updated with Android 12 (One UI 4.0) instead.[27] They all use Samsung Knox for enhanced device factory reset protection (FRP) security, and a separate version exist for enterprise use.[28] The first three S21 series smartphones were updated to Android 12 and One UI 4 on 15 November 2021.[29][30] Samsung added a "repair mode" to its Galaxy S21 on 28 July 2022, hiding users' data when they entrust an ailing device to a technician.[31]

The One UI 5 update based on Android 13 began rolling out to S21 devices on 7 November 2022.[32]

Reception

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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.[33] 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".[34] 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.[35]

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.[36] 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.[37]

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.[38]

See also

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References

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  1. ^ a b "Samsung Galaxy S21 5G". GSMArena. Archived from the original on 17 January 2021. Retrieved 14 January 2021.
  2. ^ a b "Samsung Galaxy S21+ 5G". GSMArena. Archived from the original on 17 January 2021. Retrieved 14 January 2021.
  3. ^ a b "Samsung Galaxy S21 Ultra 5G". GSMArena. Archived from the original on 3 January 2021. Retrieved 14 January 2021.
  4. ^ "Samsung Galaxy S21 FE 5G". GSMArena. Archived from the original on 4 January 2022. Retrieved 4 January 2022.
  5. ^ Sohn, Jiyoung (9 February 2022). "Samsung Unveils New Galaxy S22 Smartphones and Keeps Old Prices". Wall Street Journal. ISSN 0099-9660. Retrieved 9 February 2022.
  6. ^ "Samsung Unpacked: Reserve The Next Galaxy Smartphone | Samsung US". Samsung Electronics America. Retrieved 14 November 2022.
  7. ^ Gartenberg, Chaim (14 January 2021). "SAMSUNG GALAXY S21, S21 PLUS, AND S21 ULTRA FIRST LOOK: POLISHED DESIGN (AND PRICES)". The Verge. Archived from the original on 14 January 2021. Retrieved 14 January 2021.
  8. ^ "The Galaxy S21 FE is Samsung's new affordable phone — here's our CES 2022 hands-on". CNN. 4 January 2022. Retrieved 4 January 2022.
  9. ^ Johnson, Allison (3 January 2022). "The Galaxy S21 FE officially joins Samsung's crowded midrange lineup". The Verge. Archived from the original on 4 January 2022. Retrieved 3 April 2022.
  10. ^ "Samsung Galaxy S21 FE 5G - Full phone specifications". www.gsmarena.com. Retrieved 20 May 2024.
  11. ^ Priday, Richard (14 January 2021). "Samsung Galaxy S21 vs Galaxy S21 Plus vs Galaxy S21 Ultra: What's different?". Tom's Guide. Archived from the original on 14 January 2021. Retrieved 14 January 2021.
  12. ^ Cipriani, Jason (14 January 2021). "Galaxy S21 Ultra works with Samsung S Pen, Pro stylus: Price, features and limitations". CNET. Archived from the original on 14 January 2021. Retrieved 14 January 2021.
  13. ^ Schoon, Ben (14 January 2021). "Galaxy S21 unboxing and first impressions: No charger, but a whole lot of phone [Video]". 9to5Google. Retrieved 17 January 2021.
  14. ^ Spoonauer, Mark (17 January 2021). "Samsung Galaxy S21 Ultra review (hands on)". Tom's Guide. Retrieved 17 January 2021.
  15. ^ a b c d e f "Specs | Samsung Galaxy S21 5G vs S21+ 5G vs S21 Ultra 5G". The Official Samsung Galaxy Site. Archived from the original on 15 January 2021. Retrieved 16 January 2021.
  16. ^ Chin, Monica (14 January 2021). "Samsung's Galaxy S21 phones don't include microSD card support". The Verge. Archived from the original on 14 January 2021. Retrieved 15 January 2021.
  17. ^ Hoyle, Andrew (14 January 2021). "Samsung Galaxy S21: What to know about battery life and battery sizes". CNET. Retrieved 17 January 2021.
  18. ^ "Samsung Galaxy S21 Ultra 5G – Full phone specifications". gsmarena.com. Retrieved 18 January 2021.
  19. ^ SamMobile (18 January 2021). "What is UWB and why should Galaxy S21+/S21 Ultra owners care?". SamMobile. Retrieved 19 January 2021.
  20. ^ Gibbs, Samuel (21 January 2021). "Samsung Galaxy S21 Ultra review: the new king of Android phones". The Guardian. Retrieved 2 November 2021.
  21. ^ Samsung explains its 'fake' Moon photos
  22. ^ a b "Samsung responds to fake Moon controversy". The Verge. 15 March 2023. Archived from the original on 26 May 2023.
  23. ^ "How advanced A.I. and new hardware push the Galaxy S21 Ultra's camera forward". Digital Trends. 18 January 2021. Retrieved 19 January 2021.
  24. ^ admin (18 January 2021). "Galaxy S21 Slow Motion Feature is Retained!". Hi Speed Cameras. Retrieved 18 January 2021.
  25. ^ "The Galaxy S21 and S21 Plus do at least one thing better than the Ultra". Android Authority. 19 January 2021. Retrieved 19 January 2021.
  26. ^ "The Galaxy S21 Camera Shoots 8K Video & Turns It Into Photos". Android Headlines. 14 January 2021. Retrieved 24 September 2021.
  27. ^ Vincent, Brittany (15 January 2021). "Samsung One UI 3 arrives: These are the top features". Tom's Guide. Retrieved 17 January 2021.
  28. ^ Moorhead, Patrick. "What's New With Samsung Smartphone Security". Forbes. Retrieved 9 June 2021.
  29. ^ "Samsung's Galaxy S21 series updated to One UI 4 with new Android 12 features". Engadget. 15 November 2021. Retrieved 15 November 2021.
  30. ^ Stonham, Jonathan (15 December 2021). "How to download Official Samsung Galaxy S21 User Manual". Samsung Galaxy S21 User Manual.
  31. ^ Dobberstein, Laura. "Samsung adds 'repair mode' to South Korean smartphone". www.theregister.com. Retrieved 2 August 2022.
  32. ^ Taylor, James Lee (7 November 2022). "Breaking: Samsung rolls out Stable One UI 5.0 update for Galaxy S21 [Android 13]".
  33. ^ Bohn, Dieter (21 January 2021). "Samsung Galaxy S21 Ultra review: the real deal". The Verge. Retrieved 29 January 2021.
  34. ^ "Samsung Galaxy S21 Ultra review: Ultra refined". Android Authority. 1 March 2021. Retrieved 9 June 2021.
  35. ^ January 2021, Matt Swider 29. "Samsung Galaxy S21 Ultra review". TechRadar. Retrieved 9 June 2021.{{cite web}}: CS1 maint: numeric names: authors list (link)
  36. ^ Schoon, Ben (14 January 2021). "Samsung ditches microSD cards in Galaxy S21 series". 9to5Google.
  37. ^ "Samsung Pokes Fun at Apple Store Employees With New Galaxy S9 'Ingenious' Ads". HYPEBEAST. 23 July 2018.
  38. ^ "Why isn't Samsung including earphones and a charger plug in the box?". Samsung uk. Retrieved 9 June 2021.
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