Screen size
S2 FEWinner: 6.8"+8.1%
X21i6.3"
Quick verdict
S2 FE leads the measured specs 14-4.
Measured wins
S2 FE
14
spec wins
Overall winner
Ties
4
equal specs
X21i
4
spec wins
Screen size
Technology
S2 FE
GSM / HSPA / LTE / 5G
X21i
GSM / CDMA / HSPA / LTE
2G bands
S2 FE
GSM 850 / 900 / 1800 / 1900
X21i
GSM 850 / 900 / 1800 / 1900 , CDMA 800 & TD-SCDMA
3G bands
S2 FE
HSDPA 800 / 850 / 900 / 2100
X21i
HSDPA 850 / 900 / 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
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
NFC
equal specs3.5mm jack
SD card
Stereo speakers
X21i
1, 3, 4, 5, 8, 38, 39, 40, 41
5G bands
S2 FE
1, 3, 5, 8, 28, 38, 40, 41, 48, 66, 77, 78 SA/NSA
X21i
-
Speed
S2 FE
HSPA, LTE, 5G
X21i
HSPA, LTE
Announced
S2 FE
2026, October 06
X21i
2018, May. Released 2018, May
Status
S2 FE
Released Oct 20, 2026
X21i
Discontinued
Dimensions
S2 FE
163.9 x 76.5 x 8.6 mm (6.45 x 3.01 x 0.34 in)
X21i
154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in)
Weight
S2 FE
224 g (7.90 oz)
X21i
159 g (5.61 oz)
Build
S2 FE
Glass front, plastic frame, plastic back
X21i
-
SIM
S2 FE
Nano-SIM + Nano-SIM
X21i
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
X21i
-
Type
S2 FE
AMOLED, 1B colors, 120Hz, HDR10+, 1000 nits, 2000 nits (HBM)
X21i
Super AMOLED
Size
S2 FE
6.83 inches, 112.6 cm2 (~89.8% screen-to-body ratio)
X21i
6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio)
Resolution
S2 FE
1260 x 2800 pixels, 20:9 ratio (~450 ppi density)
X21i
1080 x 2280 pixels, 19:9 ratio (~402 ppi density)
OS
S2 FE
Android 16, OriginOS 6
X21i
Android 8.1 (Oreo), Funtouch 4
Chipset
S2 FE
Mediatek Dimensity 7300e (6 nm)
X21i
Mediatek MT6771 Helio P60 (12 nm)
CPU
S2 FE
Octa-core (4x2.5 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)
X21i
Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53)
GPU
S2 FE
Mali-G610
X21i
Mali-G72 MP3
Card slot
S2 FE
No
X21i
microSDXC (uses shared SIM slot)
Internal
S2 FE
128GB 6GB RAM, 128GB 8GB RAM
X21i
64GB 6GB RAM, 128GB 4GB RAM
Other
S2 FE
UFS 3.1
X21i
eMMC 5.1
Dual
S2 FE
50 MP, f/1.8, (wide), 1/2.93", PDAF Auxiliary lens
X21i
12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF Auxiliary lens
Features
S2 FE
LED flash, HDR, panorama
X21i
LED flash, HDR, panorama
Video
S2 FE
Yes
X21i
1080p@30fps
Single
S2 FE
32 MP, f/2.0, 22mm (wide)
X21i
24 MP, f/2.0, 26mm (wide), 1/2.8", 0.9µm
Video
S2 FE
1080p@30fps
X21i
Loudspeaker
S2 FE
Yes, with stereo speakers
X21i
Yes
3.5mm jack
S2 FE
No
X21i
Yes
Other
S2 FE
-
X21i
32-bit/192kHz Hi-Res audio
WLAN
S2 FE
Yes
X21i
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth
S2 FE
5.4, A2DP, LE
X21i
5.0, A2DP, LE
Positioning
S2 FE
GPS, GALILEO, GLONASS, QZSS, BDS
X21i
GPS, GLONASS
NFC
S2 FE
No
X21i
No
Radio
S2 FE
No
X21i
FM radio
USB
S2 FE
USB Type-C 2.0, OTG
X21i
microUSB 2.0, OTG
Sensors
S2 FE
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
X21i
Fingerprint (rear-mounted), accelerometer, proximity, compass
Type
S2 FE
Si/C Li-Ion 10000 mAh
X21i
Li-Ion 3425 mAh, non-removable
Charging
S2 FE
44W wired Reverse wired
X21i
18W wired
Colors
S2 FE
Stellar Green, Zen White, Titan Black
X21i
Black, Aurora White, Ruby Red, Night Purple
SAR
S2 FE
1.14 W/kg (head) 1.00 W/kg (body)
X21i
-
Price
S2 FE
About 360 EUR
X21i
About 430 EUR
Models
S2 FE
-
X21i
X21i A