Samsung
Samsung Galaxy S21 Ultra 5G G998B Dual SIM 128GB 12GB RAM GSM Unlocked - Black
Samsung Galaxy S21 Ultra 5G G998B Dual SIM 128GB 12GB RAM GSM Unlocked - Black
SKU: SKU:SM-G998B-5G-12-128-BK
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MyWorldPhone.com
Samsung Galaxy S21 Ultra 5G
The Ultimate Flagship Experience
Pro-level camera, ultra-smooth display, and elite performance built for power users.
Pro-Grade Camera System
Capture stunning photos and cinematic 8K video with advanced multi-lens camera technology.
8K Video Recording
Shoot in ultra-high resolution and extract crystal-clear photos from your footage.
6.8” Dynamic AMOLED 120Hz
Edge Quad HD+ display delivers smooth, vibrant, and immersive visuals.
Flagship Performance
Powered by Exynos 2100 for high-speed multitasking, gaming, and productivity.
5000mAh Battery
All-day battery life to keep up with heavy usage and entertainment.
128GB Storage + 12GB RAM
Massive memory and storage for apps, photos, videos, and multitasking.
Gorilla Glass Victus
Stronger and more durable glass for added protection.
Ultrasonic Fingerprint Sensor
Fast and secure in-display fingerprint unlocking.
Phantom Black Finish
Sleek and premium design with a bold flagship look.
5G Connectivity
Ultra-fast speeds for streaming, gaming, and downloads.
Factory Unlocked GSM
Works with GSM carriers like AT&T and T-Mobile worldwide.
Important Information
- Model: SM-G998B
- Factory Unlocked – GSM Only
- Supports 5G / 4G LTE networks
- Not compatible with Verizon, Sprint, or CDMA networks
- International Version
- No Manufacturer Warranty
- Please confirm carrier compatibility before purchase
Experience Galaxy S21 Ultra Power
Available now at MyWorldPhone.com
Versions: SM-G998B, SM-G998B/DS (International); SM-G998U (USA); SM-G998U1 (USA unlocked); SM-G998W (Canada); SM-G998N (Korea); SM-G9980 (China)
| NETWORK | Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G |
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (Dual SIM model only) | |
| CDMA 800 / 1900 & TD-SCDMA | ||
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | |
| CDMA2000 1xEV-DO | ||
| 4G bands | 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G998U1 | |
| 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G998B | ||
| 5G bands | 2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G998U1 | |
| 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G998B | ||
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (7CA) Cat20 2000/200 Mbps; 5G (5+ Gbps DL) |
| LAUNCH | Announced | 2021, January 14 |
|---|---|---|
| Status | Available. Released 2021, January 29 |
| BODY | Dimensions | 165.1 x 75.6 x 8.9 mm (6.5 x 2.98 x 0.35 in) |
|---|---|---|
| Weight | 227 g (Sub6), 229 g (mmWave) (8.01 oz) | |
| Build | Glass front (Gorilla Glass Victus), glass back (Gorilla Glass Victus), aluminum frame | |
| SIM | Single SIM (Nano-SIM) or Dual SIM (2 Nano-SIMs + eSIM, dual stand-by) | |
| IP68 dust/water resistant (up to 1.5m for 30 mins) Stylus support |
| DISPLAY | Type | Dynamic AMOLED 2X, 120Hz, HDR10+, 1500 nits (peak) |
|---|---|---|
| Size | 6.8 inches, 112.1 cm2 (~89.8% screen-to-body ratio) | |
| Resolution | 1440 x 3200 pixels, 20:9 ratio (~515 ppi density) | |
| Protection | Corning Gorilla Glass Victus | |
| Always-on display |
| PLATFORM | OS | Android 11, upgradable to Android 12, One UI 4.1 |
|---|---|---|
| Chipset | Exynos 2100 (5 nm) - International Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China |
|
| CPU | Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - USA/China |
|
| GPU | Mali-G78 MP14 - International Adreno 660 - USA/China |
| MEMORY | Card slot | No |
|---|---|---|
| Internal | 128GB 12GB RAM, 256GB 12GB RAM, 256GB 16GB RAM, 512GB 12GB RAM, 512GB 16GB RAM | |
| UFS 3.1 |
| MAIN CAMERA | Quad | 108 MP, f/1.8, 24mm (wide), 1/1.33", 0.8µm, PDAF, Laser AF, OIS 10 MP, f/4.9, 240mm (periscope telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 10x optical zoom 10 MP, f/2.4, 72mm (telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 3x optical zoom 12 MP, f/2.2, 13mm (ultrawide), 1/2.55", 1.4µm, dual pixel PDAF, Super Steady video |
|---|---|---|
| Features | LED flash, auto-HDR, panorama | |
| Video | 8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS |
| SELFIE CAMERA | Single | 40 MP, f/2.2, 26mm (wide), 1/2.8", 0.7µm, PDAF |
|---|---|---|
| Features | Dual video call, Auto-HDR | |
| Video | 4K@30/60fps, 1080p@30fps |
| SOUND | Loudspeaker | Yes, with stereo speakers |
|---|---|---|
| 3.5mm jack | No | |
| 32-bit/384kHz audio Tuned by AKG |
| COMMS | WLAN | Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct, hotspot |
|---|---|---|
| Bluetooth | 5.2, A2DP, LE | |
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | |
| NFC | Yes | |
| Radio | FM radio (Snapdragon model only; market/operator dependent) | |
| USB | USB Type-C 3.2, USB On-The-Go |
| FEATURES | Sensors | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer |
|---|---|---|
| Samsung DeX, Samsung Wireless DeX (desktop experience support) Bixby natural language commands and dictation Samsung Pay (Visa, MasterCard certified) Ultra Wideband (UWB) support |
| BATTERY | Type | Li-Ion 5000 mAh, non-removable |
|---|---|---|
| Charging | Fast charging 25W USB Power Delivery 3.0 Fast Qi/PMA wireless charging 15W Reverse wireless charging 4.5W |
| MISC | Colors | Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown, Navy |
|---|---|---|
| Models | SM-G998B, SM-G998B/DS, SM-G998U, SM-G998U1, SM-G998W, SM-G998N, SM-G9980 | |
| SAR | 0.77 W/kg (head) 1.02 W/kg (body) | |
| SAR EU | 0.71 W/kg (head) 1.58 W/kg (body) |
| TESTS | Performance | AnTuTu: 657150 (v8) GeekBench: 3518 (v5.1) GFXBench: 33fps (ES 3.1 onscreen) |
|---|---|---|
| Display | Contrast ratio: Infinite (nominal) | |
| Camera | Photo / Video | |
| Loudspeaker | -25.5 LUFS (Very good) | |
| Battery life |
Endurance rating 114h
|
| UPC/EAN | 8806092112964 |
|---|
| Warranty | No Warranty |
|---|
| 1pcs | Samsung Galaxy S21 Ultra SM-G998B |
| 1pcs | Battery. |
| 1pcs | Home Charger. |
| 1pcs | Headphone. |
| 1pcs | Data Cable. |
| 1pcs | User Manual. |
1. Which exact Galaxy S21 Ultra is this?
This is the international Samsung Galaxy S21 Ultra 5G SM-G998B/DS family, configured with 12GB RAM, 128GB storage and Phantom Black finish. Samsung’s exact SM-G998B product documentation confirms 12GB RAM, 128GB storage and Phantom Black.
2. Is Phantom Black the official color name?
Yes. Samsung officially calls this finish Phantom Black, not simply Black.
3. Is 12GB RAM + 128GB storage official?
Yes. Samsung’s exact SM-G998B specification lists 12GB RAM and 128GB internal storage.
4. What kind of RAM does it use?
LPDDR5. Samsung’s global launch specification confirms 12GB LPDDR5 for the 128GB and 256GB variants.
5. What storage technology is used?
UFS 3.1. Samsung Semiconductor also lists UFS 3.1 support for Exynos 2100.
6. How much usable storage does Samsung specify on the 128GB model?
Samsung’s exact European SM-G998B page lists approximately 101.7GB available, though available space can change with software versions and regional preinstalled apps.
7. Does it support microSD?
No. There is no microSD slot on the Galaxy S21 Ultra. Your current FAQ saying it has an expansion slot is incorrect.
8. What official memory configurations did Samsung advertise?
Samsung’s global specification lists 12GB RAM with 128GB or 256GB storage, and 16GB RAM with 512GB storage.
9. Is 512GB + 12GB an official global S21 Ultra configuration?
Not in Samsung’s global launch specification. Samsung pairs 512GB with 16GB RAM.
10. Is 256GB + 16GB an official configuration?
Samsung’s global specification does not list it. The official pairings are 128/12, 256/12 and 512/16.
Exynos 2100 processor
11. Which chipset powers this exact SM-G998B?
The international SM-G998B uses Samsung Exynos 2100.
12. What process node is Exynos 2100 built on?
5nm FinFET.
13. How many CPU cores does it have?
Eight.
14. What is the exact CPU configuration?
1× Cortex-X1 at 2.9GHz + 3× Cortex-A78 at 2.8GHz + 4× Cortex-A55 at 2.2GHz.
15. What is the maximum CPU clock?
2.9GHz.
16. Which GPU does the international version use?
Mali-G78 MP14.
17. Does this exact model use Adreno 660?
No. Adreno 660 belongs to Snapdragon 888 regional versions, not the Exynos-powered SM-G998B. Your exact listing should not mix the two platforms.
18. Does Exynos 2100 have dedicated AI hardware?
Yes. Samsung specifies a triple-core NPU plus DSP AI engine.
19. How much AI performance does Samsung advertise for Exynos 2100?
Samsung states up to 26 TOPS for the Exynos 2100 AI engine.
20. Does Exynos 2100 have an integrated 5G modem?
Yes. Samsung designed it with integrated 5G connectivity for Sub-6GHz and platform-level mmWave capability, although the actual phone’s supported radio bands depend on its regional model.
Display
21. How large is the display?
6.8 inches measured as a full rectangle, or approximately 6.6 inches accounting for rounded corners.
22. What display technology does it use?
Dynamic AMOLED 2X.
23. What is the display resolution?
3200 × 1440 Quad HD+.
24. What is the pixel density?
Samsung’s global documentation specifies approximately 515 PPI.
25. Is the display 120Hz?
Yes.
26. Is 120Hz fixed?
No. The S21 Ultra uses an adaptive 10Hz–120Hz refresh range depending on displayed content.
27. Can it run 120Hz at QHD+ resolution?
Yes. One of the S21 Ultra’s key improvements was allowing QHD+ resolution and 120Hz simultaneously.
28. What is peak brightness?
Samsung advertises up to 1500 nits peak brightness.
29. Does it support HDR10+?
Yes. The display is HDR10+ certified.
30. Does it support Eye Comfort Shield?
Yes.
Display protection & design
31. What protects the front display?
Corning Gorilla Glass Victus.
32. What material is used on the rear?
The S21 Ultra uses a Gorilla Glass Victus glass back.
33. What material is the frame?
Aluminum.
34. What are the dimensions?
165.1 × 75.6 × 8.9mm.
35. What is the weight of this Sub-6 international version?
227g. Samsung lists 227g for the Sub-6 version.
36. Why does some documentation say 229g?
That figure applies to certain mmWave regional versions. The SM-G998B Sub-6 model is 227g.
37. Is the screen curved?
Yes. Samsung describes it as an Edge QHD+ Dynamic AMOLED 2X Infinity-O Display.
38. Does it support Always-On Display?
Yes.
39. Does it support an S Pen?
Yes. The S21 Ultra was the first Galaxy S-series model with S Pen support.
40. Is an S Pen built into the phone?
No. It has no integrated S Pen silo, and Samsung states the S Pen is sold separately.
Rear cameras
41. How many rear cameras does the S21 Ultra have?
Four actual rear imaging cameras.
42. What are the four cameras?
A 108MP wide main camera, 12MP ultrawide, 10MP 3× telephoto and 10MP 10× periscope telephoto.
43. What is the main-camera resolution?
108MP. Your top MyWorldPhone camera field is correct.
44. What is the main-camera aperture?
f/1.8.
45. What is the main-camera field of view?
Samsung specifies approximately 83°.
46. What is the main-camera pixel size?
Approximately 0.8µm native.
47. Does the main camera have OIS?
Yes.
48. Does it support autofocus?
Yes, including phase-detection autofocus.
49. What is the Laser AF sensor?
A dedicated laser autofocus-assist sensor helps the main camera determine subject distance and focus. Samsung officially lists a Laser AF sensor.
50. Does the 108MP sensor support pixel binning?
Yes. Samsung markets 12MP Nona-binning for improved low-light capture.
Telephoto & ultrawide cameras
51. What is the first telephoto camera?
A 10MP f/2.4 telephoto with 3× optical zoom.
52. Does the 3× camera have OIS?
Yes.
53. Does the 3× camera autofocus?
Yes, using Dual Pixel autofocus.
54. What is the second telephoto camera?
A 10MP f/4.9 periscope telephoto with true 10× optical zoom.
55. Does the 10× periscope have OIS?
Yes.
56. Does the 10× periscope autofocus?
Yes, with Dual Pixel autofocus.
57. What is 100× Space Zoom?
Samsung combines the 10× optical periscope with digital/super-resolution processing to reach up to 100× Space Zoom. Samsung explicitly notes that higher digital zoom can reduce image quality.
58. What is the ultrawide camera?
A 12MP f/2.2 Dual Pixel autofocus ultrawide.
59. What is the ultrawide field of view?
Approximately 120°.
60. Can the ultrawide autofocus?
Yes, unlike many fixed-focus ultrawide cameras.
Front camera & video
61. What is the selfie-camera resolution?
40MP. Your top MyWorldPhone field is correct.
62. What is the selfie-camera aperture?
f/2.2.
63. Does the front camera autofocus?
Yes. Samsung specifically lists Phase Detection AF.
64. What is the front-camera field of view?
Approximately 80°.
65. What is its native pixel size?
Approximately 0.7µm.
66. What is maximum rear-video recording resolution?
8K at 24fps.
67. Does the phone record 4K60?
Yes.
68. Can every main camera perspective record 4K60?
Samsung advertised 4K60 recording across the front and rear imaging lenses, allowing consistent resolution/frame rate when switching perspectives.
69. Does the front camera record 4K?
Yes, including 4K30 and 4K60.
70. Does it support slow motion?
Yes. Samsung lists up to 240fps at Full HD and 960fps at HD for supported slow-motion modes.
Camera features
71. Does it support 12-bit HDR photos?
Yes. Samsung specifically marketed 12-bit HDR capture from the 108MP camera.
72. Does it support RAW?
Yes. Samsung offered a 12-bit RAW option for advanced photo editing.
73. What is Bright Night?
Samsung’s low-light imaging system combines improved Night Mode, noise reduction and pixel binning to improve night photography.
74. Does it support Super Steady video?
Yes.
75. Does video support HDR10+?
Yes, in supported recording modes.
76. Does the phone record stereo audio with video?
Yes.
77. Is the camera correctly described as quad camera?
Yes. On this particular Samsung model, “quad rear camera” is correct because there are four actual rear imaging cameras.
78. Is the camera island itself the only reason it is called quad camera?
No. There really are four separate rear imaging cameras, plus Laser AF and flash hardware.
79. Should your current image ALT saying “quad camera module” be changed?
No. Unlike some other pages we corrected, quad camera is accurate here.
80. What ALT improvement would still help SEO?
Use more descriptive wording such as “Phantom Black Samsung Galaxy S21 Ultra 5G rear view with 108MP quad camera and dual telephoto lenses.”
Battery & charging
81. What is the battery capacity?
5000mAh typical.
82. What is the minimum/rated battery capacity?
Samsung’s global launch documentation gives 4855mAh rated minimum.
83. Is the battery removable?
No.
84. What is maximum wired charging?
25W Super Fast Charging on supported Samsung USB PD/PPS equipment. Samsung’s official catalog lists 25W.
85. Which wired charging standard is supported?
USB Power Delivery 3.0 with PPS, while Samsung also documents compatibility with AFC and QC2.0.
86. How quickly can it reach 50%?
Samsung advertised approximately 50% in 30 minutes under its test conditions with suitable charging equipment.
87. Does it support wireless charging?
Yes.
88. What is the wireless charging capability?
Samsung’s official catalog lists 15W wireless charging for the S21 Ultra.
89. Does it support reverse wireless charging?
Yes. Samsung calls the feature Wireless PowerShare.
90. Can it charge Galaxy Buds or compatible watches from the rear of the phone?
Yes, using Wireless PowerShare with compatible devices.
Network, SIM, Wi-Fi & ports
91. Is this a Dual SIM model?
Samsung’s exact SM-G998B documentation supports Dual SIM.
92. What SIM combinations are supported?
Samsung lists SIM 1 + SIM 2 or eSIM, meaning the exact active combination can use physical SIMs and eSIM depending on firmware/region.
93. Does it support eSIM?
Yes, on supported software/regions. Samsung explicitly lists an integrated SIM and eSIM configuration for the SM-G998B.
94. Does this exact SM-G998B support CDMA/EVDO?
Samsung’s exact SM-G998B specification lists GSM, WCDMA, LTE FDD/TDD and 5G Sub-6, not CDMA2000/EVDO. Your page is mixing U.S.-variant network rows into this international SKU.
95. What 5G bands does Samsung list for this exact international model?
Samsung’s exact SM-G998B page lists Sub-6 support including n1, n3, n5, n7, n8, n20, n28, n38, n40, n41, n66, n77 and n78.
96. Does it support Wi-Fi 6E?
Samsung globally documents Wi-Fi 6E capability for the Galaxy S21 Ultra. Exact 6GHz operation can depend on country, regulatory domain and router support.
97. What Bluetooth version does the SM-G998B use?
Bluetooth 5.2.
98. Does it support NFC and UWB?
Yes, NFC and Ultra-Wideband (UWB) are both officially supported.
99. What USB port does it use?
USB Type-C, USB 3.2 Gen 1.
100. Does USB-C support external display output?
Yes. Samsung officially supports DisplayPort over USB-C with up to 4K UHD 60Hz video output via a compatible HDMI adapter, as well as Samsung DeX.
Factory-unlocked status does not guarantee activation on every carrier. The exact SM-G998B supports a broad set of international LTE and Sub-6 5G bands, but actual U.S. service depends on supported bands, IMEI eligibility, VoLTE/IMS provisioning, eSIM configuration, carrier certification and current carrier policies. The old “GSM vs. CDMA” distinction on the live page is no longer an adequate compatibility test.
