Samsung Galaxy S2 (SGH-i777 16GB) vs Samsung Galaxy A51 (SM-A515F/DSM 64GB)

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Side by side comparison between Samsung Galaxy S2 (SGH-i777) vs Samsung Galaxy A51 phones, differences, pros, cons and full specifications. What's the better?

1/4/2020 6:31 PM, updated: 11/21/2022 8:39 AM

Compare Samsung Galaxy A51 X Samsung Galaxy S2 (SGH-i777 16GB) 03Points

Specifications Compare Models Pictures

4.3"
AMOLED

480x800

8
MP

2mp

1GB
RAM

Dual-core

1650
mAh

(Removable)

25Points Samsung Galaxy A51 (SM-A515F/DSM 64GB) Compare Samsung Galaxy S2 (SGH-i777) X

Specifications Compare Models Pictures

6.5"
AMOLED

1080x2400

48
MP

32mp

4GB
RAM

Octa-core

4000
mAh

(Non removable)

What's the better phone? Samsung Galaxy A51 (SM-A515F/DSM 64GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

3 Advantages Samsung Galaxy S2 (SGH-i777 16GB)	vs	25 Advantages Samsung Galaxy A51 (SM-A515F/DSM 64GB)
+122 grams (4.27 ounces)41% Lighter	vs	172 grams (6.02 ounces)
+Proximity sensorAdvantage Sensors help you use the device	vs	Virtual proximity sensor
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	LiPo: li-ion polymer (Non removable)
1.2GHz 32bit Dual-core	vs	+2.3GHz 64bit Octa-core (10nm)2 times More powerful processor, you can open your applications faster
1GB LPDDR2	vs	+4GB LPDDR4X3 times More RAM memory. Typically more responsive and better for multitasking.
16GB (13GB available)	vs	+64GB (48GB available)3 times More internal storage for applications and files
Until 32GB microSD, microSDHC	vs	+Until 1TB microSD, microSDXC31 times More external storage for files using memory cards
8.9 millimeters (0.35 inches)	vs	+7.9 millimeters (0.31 inches)13% Thinner
480x800 pixels	vs	+1080x2400 pixels6 times Higher resolution screen
217 PPI	vs	+405 PPI87% Crisper display of text, images and videos because it has more pixels per inch (ppi)
4.3"	vs	+6.5"51% Larger screen
(back) 8MP	vs	+(quad camera) 48MP + 12MP + 5MP + 5MP8 times Higher resolution main camera
Not supported	vs	+HDR photo on both camerasAdvantage The HDR technology produced photos with more detail in dark areas
(front) 2MP	vs	+(front) 32MP16 times Higher resolution secondary camera to take pictures and selfies
Full HD (1920x1080)	vs	+4K UHD (3840x2160)3 times More image quality for recording videos with the primary camera
Android 2.3.6 Gingerbread	vs	+Android 13Advantage Android 13 is newer and safer
3G+ HSPA+	vs	+4G LTE-AAdvantage The 4G LTE-A network is newer and faster
(3G+ HSPA+) 21 Mbps	vs	+(4G LTE-A) 600 Mbps28 times Faster for surfing the internet and download files
Not supported	vs	+ANT+Advantage Sensors help you use the device
Not supported	vs	+Face unlock 2DAdvantage Sensors help you use the device
Not supported	vs	+Fingerprint sensor (under display)Advantage Sensors help you use the device
1650 mAh	vs	+4000 mAh142% Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
1 slot (Single-SIM) (dedicated slot)	vs	+2 slots (Dual-SIM) (dedicated slot)Advantage You can have more mobile carriers/operators on the same device.
Not supported	vs	+FM (RDS)Advantage The radio lets you listen to your songs and sports in general
802.11 a/b/g/n [wifi4]	vs	+802.11 a/b/g/n/ac [wifi5]Advantage WiFi 802.11 a/b/g/n/ac [wifi5] is newer and faster
3.0 + A2DP	vs	+5.0 + A2DP/LEAdvantage Bluetooth 5.0 + A2DP/LE is newer and faster
MicroUSB 2.0, USB OTG On-The-Go	vs	+Type-CAdvantage Reversible connector, you can stick in a USB-C cable any which way; either side is up.
HTML, XHTML, Flash player	vs	+HTML, XHTML, HTML5Advantage Better sites viewing on the internet

21 Common items in both devices

Plastic body, glass front

Super AMOLED Plus / Super AMOLED

16 million

LED flash

Only digital zoom

Autofocus / PDAF: phase detection autofocus

EIS: Digital stabilization

+14 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differences

📱 Model features
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Change model		Choose the model
Model	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Other model names	AT&T Samsung Galaxy S II i777, Samsung Attain	Samsung Galaxy A51 SM-A515F/DSM
Country or region available	USA	Kazakhstan, Russia
Brand	Samsung	Samsung
Release date	10/2/2011	12/16/2019, Announced: 12/12/2019
Depth	8.9 millimeters (0.35 inches)	7.9 millimeters (0.31 inches)
Size (width x height)	66 x 126 millimeters (2.6 x 4.96 in)	73.6 x 158.5 millimeters (2.9 x 6.24 in)
Weight	122 grams (4.27 ounces)	172 grams (6.02 ounces)
Build, materials	Plastic body, glass front	Plastic body, glass front
Protection against water and others	Not supported	Not supported
📲 Display
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Display type	Super AMOLED Plus	Super AMOLED
Screen size	4.3" inches	6.5" inches
Screen-to-body ratio	~63.3% (screen-to-body ratio)	~87.4% (screen-to-body ratio)
Display resolution	480x800 pixels	1080x2400 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch
Pixel density (dot pitch)	217 PPI	405 PPI
Colors	16 million	16 million
Scratch-resistant glass	Gorilla Glass	Gorilla Glass 3
Refresh rate	feature not registered	60Hz
Display features	feature not registered	Always-On Display
🤖 Operating System
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
System version	Android 2.3.4 Gingerbread	Android 10
Firmware update	Android 2.3.6 Gingerbread	Android 13
User Interface	feature not registered	One UI 2.5 / 3.1 / 4.1 / 5.0
⚙️ Processor
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Chipset	32bit: Samsung Exynos 4 Dual 4210 (45nm)	64bit: Samsung Exynos 9611 (10nm)
CPU	Dual-core, 1 processor: 2x 1.2GHz ARM Cortex-A9 (Dual-core)	Octa-core, 2 processors: 4x 2.3GHz ARM Cortex-A73 (Quad-core) 4x 1.7GHz ARM Cortex-A53 (Quad-core)
GPU graphical controller	ARM Mali-400 MP4	ARM Mali-G72 MP3 (850MHz)
Performance (benchmark)	feature not registered	AnTuTu: 113051 (v7), 175363 (v8) Geekbench: 5401 (v4.4), 1294 (v5.1) GFXBench: 5.6fps (ES 3.1 onscreen)
💽 Memory and storage
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
RAM memory	1GB LPDDR2	4GB LPDDR4X
Internal storage	16GB (13GB available)	64GB (48GB available) eMMC 5.1
External storage	Until 32GB microSD, microSDHC (dedicated slot)	Until 1TB microSD, microSDXC (dedicated slot)
📶 Mobile networks
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Dual-SIM	Not supported	Dual-SIM Standby - Call active on one sim card (dedicated slot)
SIM card	1 slot (Single-SIM) Standard mini-SIM (2FF)	2 slots (Dual-SIM) nano-SIM (4FF)
Maximum Download / Upload	21/5.76 Mbps	600/150 Mbps
Network technology	2G, 3G	2G, 3G, 4G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Quad-Band 850/900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	GSM 850/900/1800/1900	GSM 850/900/1800/1900
Primary 3G network	UMTS 850/1900/2100	UMTS 850/900/1700/1900/2100
Primary 4G network	Not supported	LTE Cat12/13 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66) TD-LTE (38, 40, 41) VoLTE
Primary 5G network	Not supported	Not supported
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
Secondary 2G network	Not supported	GSM 850/900/1800/1900
Secondary 3G network	Not supported	Not supported
Secondary 4G network	Not supported	Not supported
Secondary data network	Not supported	GPRS, EDGE
📷 Camera
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Back camera (main camera)	8 megapixels	(quad camera) 48 megapixels 12MP ultrawide f/2.213mm1.12µm 5MP telephoto f/2.440mm 5MP depth f/2.21/5.0"1.12µm
Main camera resolution	3264x2448 pixels	8000x6000 pixels
Video recording (primary)	Full HD (1920x1080) 30 fps	4K UHD (3840x2160) 30 fps
Flash	LED flash	LED flash
Focal aperture	feature not registered	f/2.0 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	feature not registered	1/2" inches
Pixel size	feature not registered	0.8µm pixel
Autofocus	Autofocus	PDAF: phase detection autofocus
Touch focus	Supported	Supported
Image stabilization	EIS: Digital stabilization	EIS: Digital stabilization
Zoom	Only digital zoom	Only digital zoom
Face/smile detection	Face detection	Face detection, Smile detection
BSI sensor	Not supported	Not supported
HDR	Not supported	HDR photo on both cameras
Camera extras	feature not registered	feature not registered
📸 Front camera
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Front camera (secondary)	2 megapixels	32 megapixels
Front camera resolution	1600x1200 pixels	6528x4896 pixels
Video recording (secondary)	Not supported	4K UHD (3840x2160)
Front flash	Not supported	Not supported
Focal aperture	feature not registered	f/2.2 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	feature not registered	1/2.8" inches
Pixel size	feature not registered	0.8µm pixel
🔉 Sound and multimedia
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Loudspeaker	Supported	Supported
Active noise cancellation	2 microphones or more	2 microphones or more
Radio	Not supported	FM (RDS)
TV	Not supported	Not supported
Video formats	MP4, H.264, H.263, XviD	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, WMA, eAAC+, FLAC	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
USB	MicroUSB 2.0, USB OTG On-The-Go	USB 2.0 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	3.5mm jack
TV output	Micro-B USB MHL	Not supported
Bluetooth	3.0 + A2DP	5.0 + A2DP/LE
WiFi	802.11 a/b/g/n [wifi4] (2.4GHz, 5GHz) WiFi Direct, hotspot	802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	feature not registered	Not supported
GPS	A-GPS, GeoTagging	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Not supported	Not supported
Infrared port	feature not registered	Not supported
🧭 Sensors
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Sensors	Accelerometer Ambient light sensor Compass Gyroscope Proximity sensor	Accelerometer Ambient light sensor ANT+ Compass Face unlock 2D Fingerprint sensor (under display) Gyroscope Hall effect Virtual proximity sensor
Vibrating alert	Supported	Supported
🔋 Battery
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Battery type	Li-Ion: lithium-ion (Removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	1650 mAh	4000 mAh
Charger, watts	Wired charging	15W Wired fast charging
Inductive / wireless charging	feature not registered	Not supported
Talk time autonomy	8 hours	feature not registered
Standby	400 hours (16.7 days)	feature not registered
➕ Other features
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
Call control	Voice dialing, Voice recorder, Voice commands	Voice dialing, Voice recorder
Messaging	SMS (Swype), MMS, E-mail, Push mail	SMS (T9), MMS, E-mail, Push mail
Hands-free calling	Supported	Supported
Video calling	Supported	Supported
Ringtones	Polyphonic and customized	Polyphonic and customized
Web browser	HTML, XHTML, Flash player	HTML, XHTML, HTML5
Antenna	Internal antenna	Internal antenna
Qwerty physical keyboard	Not supported	Not supported
Miscellaneous	• Colors: Black • Samsung TouchWiz 4.0 UI • Java framework	• Colors: Prism, Crush Black, White, Blue, Pink
☢️ Radiation rate
	Galaxy S2 (SGH-i777 16GB)	Galaxy A51 (SM-A515F/DSM 64GB)
SAR 1.6W/kg (USA, Mexico, etc.)	feature not registered	feature not registered
SAR 2W/kg (Europe, UK, etc.)	feature not registered	0.369W/kg (head), 1.59W/kg (body)