Screen size
S2 FEWinner: 6.8"+4.4%
Y51s6.5"
Quick verdict
S2 FE leads the measured specs 12-3.
Measured wins
S2 FE
12
spec wins
Overall winner
Ties
7
equal specs
Y51s
3
spec wins
Screen size
Technology
S2 FE
GSM / HSPA / LTE / 5G
Y51s
GSM / CDMA / HSPA / LTE / 5G
2G bands
S2 FE
GSM 850 / 900 / 1800 / 1900
Y51s
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900 & TD-SCDMA
3G bands
S2 FE
HSDPA 800 / 850 / 900 / 2100
Y51s
HSDPA 850 / 900 / 1700(AWS) / 2100
4G bands
S2 FE
1, 3, 4, 5, 8, 19, 28, 38, 40, 41, 42, 43, 48, 66
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
equal specsMain camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
SD card
equal specsStereo speakers
Y51s
1, 3, 4, 5, 8, 34, 38, 39, 40, 41
5G bands
S2 FE
1, 3, 5, 8, 28, 38, 40, 41, 48, 66, 77, 78 SA/NSA
Y51s
1, 41, 78 SA/NSA
Speed
S2 FE
HSPA, LTE, 5G
Y51s
HSPA, LTE, 5G (3.6+ Gbps DL)
Announced
S2 FE
2026, October 06
Y51s
2020, July 24. Released 2020, July 29
Status
S2 FE
Released Oct 20, 2026
Y51s
Discontinued
Dimensions
S2 FE
163.9 x 76.5 x 8.6 mm (6.45 x 3.01 x 0.34 in)
Y51s
162 x 76.6 x 8.5 mm (6.38 x 3.02 x 0.33 in)
Weight
S2 FE
224 g (7.90 oz)
Y51s
190 g (6.70 oz)
Build
S2 FE
Glass front, plastic frame, plastic back
Y51s
-
SIM
S2 FE
Nano-SIM + Nano-SIM
Y51s
Nano-SIM + Nano-SIM
Other
S2 FE
IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) MIL-STD-810H compliant* * does not guarantee ruggedness or use in extreme conditions
Y51s
-
Type
S2 FE
AMOLED, 1B colors, 120Hz, HDR10+, 1000 nits, 2000 nits (HBM)
Y51s
IPS LCD
Size
S2 FE
6.83 inches, 112.6 cm2 (~89.8% screen-to-body ratio)
Y51s
6.53 inches, 104.7 cm2 (~84.4% screen-to-body ratio)
Resolution
S2 FE
1260 x 2800 pixels, 20:9 ratio (~450 ppi density)
Y51s
1080 x 2340 pixels, 19.5:9 ratio (~395 ppi density)
OS
S2 FE
Android 16, OriginOS 6
Y51s
Android 10, Funtouch 10.5
Chipset
S2 FE
Mediatek Dimensity 7300e (6 nm)
Y51s
Exynos 880 (8 nm)
CPU
S2 FE
Octa-core (4x2.5 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)
Y51s
Octa-core (2x2.0 GHz Cortex-A77 & 6x1.8 GHz Cortex-A55)
GPU
S2 FE
Mali-G610
Y51s
Mali-G76 MP5
Card slot
S2 FE
No
Y51s
No
Internal
S2 FE
128GB 6GB RAM, 128GB 8GB RAM
Y51s
128GB 6GB RAM, 128GB 8GB RAM
Other
S2 FE
UFS 3.1
Y51s
UFS 2.1
Dual
S2 FE
50 MP, f/1.8, (wide), 1/2.93", PDAF Auxiliary lens
Y51s
-
Features
S2 FE
LED flash, HDR, panorama
Y51s
LED flash, HDR, panorama
Video
S2 FE
Yes
Y51s
4K@30fps, 1080p@30fps; gyro-EIS
Triple
S2 FE
-
Y51s
48 MP, f/1.8, 25mm (wide), 1/2.0", 0.8µm, PDAF 2 MP (macro) Auxiliary lens
Single
S2 FE
32 MP, f/2.0, 22mm (wide)
Y51s
8 MP, f/2.0, (wide)
Video
S2 FE
1080p@30fps
Y51s
1080p@30fps
Features
S2 FE
-
Y51s
HDR
Loudspeaker
S2 FE
Yes, with stereo speakers
Y51s
Yes
3.5mm jack
S2 FE
No
Y51s
Yes
WLAN
S2 FE
Yes
Y51s
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth
S2 FE
5.4, A2DP, LE
Y51s
5.0, A2DP, LE, aptX HD
Positioning
S2 FE
GPS, GALILEO, GLONASS, QZSS, BDS
Y51s
GPS, GLONASS, BDS, GALILEO
NFC
S2 FE
No
Y51s
No
Radio
S2 FE
No
Y51s
No
USB
S2 FE
USB Type-C 2.0, OTG
Y51s
microUSB 2.0, OTG
Sensors
S2 FE
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Y51s
Fingerprint (side-mounted), accelerometer, proximity, compass
Type
S2 FE
Si/C Li-Ion 10000 mAh
Y51s
4500 mAh
Charging
S2 FE
44W wired Reverse wired
Y51s
18W wired
Colors
S2 FE
Stellar Green, Zen White, Titan Black
Y51s
Black, Blue, White
SAR
S2 FE
1.14 W/kg (head) 1.00 W/kg (body)
Y51s
-
Price
S2 FE
About 360 EUR
Y51s
About 250 EUR
Models
S2 FE
-
Y51s
V2002A