Samsung Galaxy S21 Safety Tip: Turning Off Wi-Fi and Bluetooth Reduces Radiation.

This SAR chart reveals how turning off Wi-Fi and Bluetooth on your Samsung Galaxy S21 can significantly reduce your exposure to radiation. Our SAR comparison chart shows that by simply turning off these transmitters, you can lower the RF radiation exposure to your head by 49%, and you can lower exposure to the body by 29.9%, when considering these differences between cellular-only (Wi-Fi/Bluetooth OFF) and simultaneous use exposure (Wi-Fi/Bluetooth ON), a wise way to reduce excessive phone radiation is to tap off unnecessary transmitters when not in use. Additionally, when using your phone as a hotspot, turning off Bluetooth can reduce your exposure by up to 42.3% according to the FCC SAR report for device number A3LSMG991U.

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• Overview
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General || General Spec Review

Phone	Samsung Galaxy S21
Technology	GSM / CDMA / HSPA / EVDO / LTE / 5G
Announced	14 January 2021
Status	Available. Released 2021, January 29
Price	$ 473.00 / € 702.88 / £ 559.90 / ₹ 59,879
Model Names	SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910

Display || Display Spec Review

Type	Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak)
Display Technology => A number of display technologies and types used in mobile phones => TFT (Thin Film Transistor), IPS (In-Place Switching), OLED (Organic Light Emitting Diode), AMOLED (Active-Matrix Organic Light-Emitting Diode), Super AMOLED (an even advanced version of AMOLED), Resistive Touchscreen (Resistive touchscreens contain two layer of conductive material with a very small gap between them which acts as a resistance), Capacitive Touchsceen (Capacitive touchscreen technology consists of a layer of glass coated with a transparent conductor)
Size	6.2 inches, 94.1 cm2 (~87.2% screen-to-body ratio)
Resolution	1080 x 2400 pixels, 20:9 ratio (~421 ppi density)
Protection	Corning Gorilla Glass Victus
Display Protection => Gorilla Glass is a special alkali-aluminosilicate glass shield with exceptional damage resistance that helps protect mobile displays from scratches, drops, and bumps of everyday use, It is always better to go for a smartphone with Gorilla Glass for that added protection and peace of mind.
Features	Corning Gorilla Glass Victus Always-on display
Display Test	Contrast ratio: Infinite (nominal)

Camera || Camera Spec Review

Main Camera	Triple Camera: 12 MP, f/1.8, 26mm (wide), 1/1.76", 1.8m, Dual Pixel PDAF, OIS 64 MP, f/2.0, 29mm (telephoto), 1/1.72", 0.8m, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom 12 MP, f/2.2, 13mm, 120 (ultrawide), 1/2.55" 1.4m, Super Steady video
Camera is able to capture photographs and usually videos, The most important characteristics of a camera are the resolution (measured in megapixels), lens focus type (fixed or automatic), higher megapixel cameras are known to capture higher quality photos, but not always a good measurement of the photos quality.
Main 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 Camera: 10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22m, Dual Pixel PDAF
Selfie Camera Features	Dual video call, Auto-HDR
Selfie Camera Video	4K@30/60fps, 1080p@30fps

Battery || Battery Spec Review

Type	Li-Ion 4000 mAh, non-removable
Battery Type => Cell phones run on various kinds of batteries depending on the manufacturer, phone size or shape and features. There are basically four types of cell phone batteries => Lithium Polymer, Lithium Ion, Nickel Metal Hydride and Nickel Cadmium.
Battery Test	Endurance rating 93h
Battery Capacity is a measure (typically in Amp-hr) of the charge stored by the battery, and is determined by the mass of active material contained in the battery. The battery capacity represents the maximum amount of energy that can be extracted from the battery under certain conditions.
Charging	Fast charging 25W USB Power Delivery 3.0 Fast Qi/PMA wireless charging 15W Reverse wireless charging 4.5W

Hardware || Hardware Spec Review

Operating System	Android 11, One UI 3.1
Chipset	Exynos 2100 (5 nm) - InternationalQualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China
Chipset is a group of integrated circuits designed to perform one or a more dedicated functions, often with real time computing constraints, Popular smartphones are equipped with more advanced embedded chipsets that can do many different tasks depending on their programming.
CPU	Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - InternationalOcta-core (1x2.84 GHz Kryo 680 & 3x2.42 GHz Kryo 680 & 4x1.80 GHz Kryo 680) - USA/China
CPU (Central Processing Unit) mostly known as processors, CPU processes instructions in order to carry out certain functions that make your device operate properly. Processors are often described as the brain of computers, smartphones and tablets, Smartphones and tablets rely on processors to carry out their every task, Processors are an incredibly important factor in selecting any type of computing device, including your smartphone.
GPU	Mali-G78 MP14 - InternationalAdreno 660 - USA/China
GPU (Graphics Processing Unit) is a single-chip processor designed to rapidly manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display, This includes things such as lighting effects, object transformations, and 3D motion.
Performance	AnTuTu: 584055 (v8) GeekBench: 3238 (v5.1) GFXBench: 60fps (ES 3.1 onscreen)
Internal Storage	128GB 8GB RAM, 256GB 8GB RAM
Internal Storage is a data storage space (flash memory) mostly used in smartphones, tablets and other electronic devices where operating system, apps, music, photos, videos, files and other user data Is stored.
Card Slot	No
Memory Card Slot is a special slot for inserting a memory card. Memory cards allow you to expand the phone's built-in memory, A memory card (sometimes called a flash memory card or a storage card) is a small storage medium used to store data such as text, pictures, audio, and video, for use on small, portable or remote computing devices such as mobile phones, mp3 players, digital cameras.
Sensors	Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer
Sensors are electronic components that detects and responds to some type of input from the physical environment. The specific input could be light, heat, motion, moisture, pressure and location, The output is generally a signal that is converted to use in computing systems, a location sensor, such as a GPS receiver is able to detect current location of your electronic device.

Connectivity || Connectivity Spec Review

Wi-fi	Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, hotspot
Wi-Fi is a popular wireless networking technology using radio waves to provide high-speed network connections that allows devices to communicate without cords or cables, Wi-Fi is increasingly becoming the preferred mode of internet connectivity all over the world.
Bluetooth	5.0, A2DP, LE
Bluetooth is a wireless communications technology for exchanging data between mobile phones, headsets, computers and other network devices over short distances without wires, Bluetooth technology was primarily designed to support simple wireless networking of personal consumer devices.
USB	USB Type-C 3.2, USB On-The-Go
GPS	Yes, with A-GPS, GLONASS, BDS, GALILEO
GPS The Global Positioning System is a satellite-based radio navigation system, GPS permits users to determine their position, velocity and the time 24 hours a day, in all weather, anywhere in the world, In order to locate your position, your device or GPS receiver must have a clear view of the sky.
NFC	Yes
NFC (Near field communication) is a set of standards for smartphones and similar devices to establish peer-to-peer radio communications with each other by touching them together or bringing them into proximity, usually no more than a few inches.
Radio	FM radio (Snapdragon model only; market/operator dependent)

Sound || Sound Spec Review

Loudspeaker	Yes, with stereo speakers
3.5mm Jack	No
Loudspeaker Test	-26.4 LUFS (Good)

Design || Design Spec Review

Type	Bar
Design Type called form factor refers to a mobile phone's size, shape, and style as well as the layout and position of major components of phone. There are three major form factors seen in mobile phones => bar phones, folding phones and sliding phones.
Dimensions	151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in)
Weight	169 g (Sub6), 171 g (mmWave) (5.96 oz)
Colors	Phantom Gray, Phantom White, Phantom Violet, Phantom Pink
Build	Glass front (Gorilla Glass Victus), plastic back, aluminum frame

Network || Network Spec Review

Speed	HSPA 42.2/5.76 Mbps, LTE-A (CA), 5G
SIM	Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM and/or eSIM, dual stand-by)
SIM (Subscriber Identity Module) is a small card that contains mobile network subscriber's account information. This allows the phone using the card to attach to a mobile network. The SIM card is most commonly associated with GSM and UMTS mobile networks. Moving a SIM card from one phone to another allows a subscriber to switch mobile phones without having to contact their mobile network carrier. SIM cards can also be used by a phone to store limited amounts of data, such as phone numbers and text messages.
2G Network	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (Dual SIM model only)
3G Network	HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G Network	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-G991U1
5G Network	2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G991U1

FCC SAR Levels || FCC SAR Levels Spec Review

FCC Approval Date	08 December 2020
This is the date the phone SAR test was completed before the phone's release to the public as required by law.
FCC ID	A3LSMG991U
The FCC ID is the code used to register a device for FCC compliance
FCC Report Link	FCC Specific Absorption Rate (SAR) Report For Manufacturer Submitted Model
A direct link to the FCC's website for confirming SAR levels that are listed on our website - We did the homework for you!
US SAR Ratings	USA Legal Limit is 1.6 W/kg - FCC SAR testing is measured in watts per kilogram (or W/kg) averaged over ONE gram of simulated biological tissue.
USA Legal Limit is 1.6 W/kg
Head SAR Level	0.74 W/kg
SAR test when held against your head when only using cellular service. Wifi and other transmitter are NOT active
Body SAR Level	1.08 W/kg
SAR test when held against your body only using cellular service. Wifi and other transmitter are NOT active
Product Specific Use	1.11 W/Kg
SAR test when held against your body only using the phone as a hotspot. Cellular and other transmitter are NOT active
Simultaneous Transmission	1.58 W/kg
The highest possible SAR recorded with ALL transmitters active, Cellular, WiFi, and Hotspot
Simultaneous Head	1.45 W/kg
The highest possible SAR test when held against your HEAD with cellular and WiFi transmitters active,
Simultaneous Body	1.54 W/kg
The highest possible SAR test when held against your BODY with cellular and WiFi transmitters active,
Hotspot SAR	1.58 W/kg
The highest possible SAR test when held against your BODY using the phone as a hotspot with cellular and WiFi transmitters active,

EU SAR Level || EU SAR Level Spec Review

EU SAR Ratings	European Legal Limit is 2.0 W/kg - EU SAR testing is measured in watts per kilogram (or W/kg) averaged over TEN grams of simulated biological tissue.
Head SAR Level	0.46 W/kg
Body SAR Level	1.51 W/kg

SAR Test	SAR Rank	PhoneRank	Unique SAR Levels Compared	Total Phones Compared
US head	19	20	49	86
US body	33	40	47	86
Productspecific	24	41	38	86
Simul headUS	32	50	44	86
Simul bodyUS	36	61	41	86
Hotspot	30	55	31	86

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