Screen size
iQOO U3x6.6"
S2 FEWinner: 6.8"+3.7%
Quick verdict
S2 FE leads the measured specs 13-4.
Measured wins
iQOO U3x
4
spec wins
Ties
5
equal specs
S2 FE
13
spec wins
Overall winner
Screen size
Technology
iQOO U3x
GSM / CDMA / HSPA / CDMA2000 / LTE / 5G
S2 FE
GSM / HSPA / LTE / 5G
2G bands
iQOO U3x
GSM 850 / 900 / 1800 / 1900 , CDMA 800
S2 FE
GSM 850 / 900 / 1800 / 1900
3G bands
iQOO U3x
HSDPA 850 / 900 / 1700(AWS) / 2100 , CDMA2000 1x
S2 FE
HSDPA 800 / 850 / 900 / 2100
4G bands
iQOO U3x
1, 3, 4, 5, 8, 28, 34, 38, 39, 40, 41
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
USB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
SD card
equal specsStereo speakers
S2 FE
1, 3, 4, 5, 8, 19, 28, 38, 40, 41, 42, 43, 48, 66
5G bands
iQOO U3x
1, 3, 28, 41, 77, 78 SA/NSA
S2 FE
1, 3, 5, 8, 28, 38, 40, 41, 48, 66, 77, 78 SA/NSA
Speed
iQOO U3x
HSPA, LTE, 5G
S2 FE
HSPA, LTE, 5G
Announced
iQOO U3x
2021, March 19
S2 FE
2026, October 06
Status
iQOO U3x
Available. Released 2021, March 22
S2 FE
Released Oct 20, 2026
Dimensions
iQOO U3x
164.2 x 75.4 x 8.4 mm (6.46 x 2.97 x 0.33 in)
S2 FE
163.9 x 76.5 x 8.6 mm (6.45 x 3.01 x 0.34 in)
Weight
iQOO U3x
185.5 g (6.56 oz)
S2 FE
224 g (7.90 oz)
SIM
iQOO U3x
Nano-SIM + Nano-SIM
S2 FE
Nano-SIM + Nano-SIM
Build
iQOO U3x
-
S2 FE
Glass front, plastic frame, plastic back
Other
iQOO U3x
-
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
Type
iQOO U3x
IPS LCD, 90Hz
S2 FE
AMOLED, 1B colors, 120Hz, HDR10+, 1000 nits, 2000 nits (HBM)
Size
iQOO U3x
6.58 inches, 104.3 cm2 (~84.2% screen-to-body ratio)
S2 FE
6.83 inches, 112.6 cm2 (~89.8% screen-to-body ratio)
Resolution
iQOO U3x
1080 x 2408 pixels, 20:9 ratio (~401 ppi density)
S2 FE
1260 x 2800 pixels, 20:9 ratio (~450 ppi density)
OS
iQOO U3x
Android 11, OriginOS 1.0 for iQOO
S2 FE
Android 16, OriginOS 6
Chipset
iQOO U3x
Qualcomm SM4350 Snapdragon 480 5G (8 nm)
S2 FE
Mediatek Dimensity 7300e (6 nm)
CPU
iQOO U3x
Octa-core (2x2.0 GHz Kryo 460 & 6x1.8 GHz Kryo 460)
S2 FE
Octa-core (4x2.5 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)
GPU
iQOO U3x
Adreno 619
S2 FE
Mali-G610
Card slot
iQOO U3x
No
S2 FE
No
Internal
iQOO U3x
64GB 6GB RAM, 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM
S2 FE
128GB 6GB RAM, 128GB 8GB RAM
Other
iQOO U3x
UFS 2.1
S2 FE
UFS 3.1
Dual
iQOO U3x
13 MP, f/2.2, (wide), PDAF Auxiliary lens
S2 FE
50 MP, f/1.8, (wide), 1/2.93", PDAF Auxiliary lens
Features
iQOO U3x
LED flash, HDR, panorama
S2 FE
LED flash, HDR, panorama
Video
iQOO U3x
4K@30fps, 1080p@30fps
S2 FE
Yes
Single
iQOO U3x
8 MP, f/2.0, (wide)
S2 FE
32 MP, f/2.0, 22mm (wide)
Features
iQOO U3x
HDR
S2 FE
-
Video
iQOO U3x
1080p@30fps
S2 FE
1080p@30fps
Loudspeaker
iQOO U3x
Yes
S2 FE
Yes, with stereo speakers
3.5mm jack
iQOO U3x
Yes
S2 FE
No
WLAN
iQOO U3x
Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
S2 FE
Yes
Bluetooth
iQOO U3x
5.1, A2DP, LE, aptX HD
S2 FE
5.4, A2DP, LE
Positioning
iQOO U3x
GPS, GLONASS, BDS, GALILEO
S2 FE
GPS, GALILEO, GLONASS, QZSS, BDS
NFC
iQOO U3x
No
S2 FE
No
Radio
iQOO U3x
No
S2 FE
No
USB
iQOO U3x
USB Type-C 2.0, OTG
S2 FE
USB Type-C 2.0, OTG
Sensors
iQOO U3x
Fingerprint (side-mounted), accelerometer, proximity, compass
S2 FE
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Type
iQOO U3x
5000 mAh
S2 FE
Si/C Li-Ion 10000 mAh
Charging
iQOO U3x
18W wired
S2 FE
44W wired Reverse wired
Colors
iQOO U3x
Gray, Aurora
S2 FE
Stellar Green, Zen White, Titan Black
Models
iQOO U3x
V2106A
S2 FE
-
Price
iQOO U3x
About 160 EUR
S2 FE
About 360 EUR
SAR
iQOO U3x
-
S2 FE
1.14 W/kg (head) 1.00 W/kg (body)