Ulefone Armor X31 Pro vs vivo S2 FE

399 USD

399 USD

Available

Available

Ulefones

Vivo Mobiles

Ulefone Armor X31 Pro

vivo S2 FE

2025, January 01

2026, September 06

GSM / CDMA / HSPA / LTE / 5G

GSM / HSPA / LTE / 5G

GSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900

GSM 850 / 900 / 1800 / 1900

HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100

HSDPA 800 / 850 / 900 / 2100

1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 34, 38, 39, 40, 41, 66, 71

1, 3, 4, 5, 8, 19, 28, 38, 40, 41, 42, 43, 48, 66

1, 2, 3, 5, 7, 8, 20, 25, 28, 38, 40, 41, 66, 71, 77, 78, 79 SA/NSA

1, 3, 5, 8, 28, 38, 40, 41, 48, 66, 77, 78 SA/NSA

HSPA, LTE

HSPA, LTE, 5G

173.8 x 82 x 13.7 mm (6.84 x 3.23 x 0.54 in)

163.9 x 76.5 x 8.6 mm (6.45 x 3.01 x 0.34 in)

306 g (10.79 oz)

224 g (7.90 oz)

Corning Gorilla Glass 5 IP68/IP69K dust/water resistant (up to 1.5m for 30 min) Drop-to-concrete resistance from up to 2m MIL-STD-810H compliant Dedicated flashlight 120 lm

Glass front, plastic frame, plastic back does not guarantee ruggedness or use in extreme conditions 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

Nano-SIM + Nano-SIM

Nano-SIM + Nano-SIM

Black, Black/Orange, Black/Green

Stellar Green, Zen White, Titan Black

IPS LCD, 120Hz, 800 nits (HBM)

AMOLED, 1B colors, 120Hz, HDR10+, 1000 nits, 2000 nits (HBM)

6.56 inches, 103.4 cm2 (~72.5% screen-to-body ratio)

6.83 inches, 112.6 cm2 (~89.8% screen-to-body ratio)

720 x 1612 pixels, 20:9 ratio (~269 ppi density)

1260 x 2800 pixels, 20:9 ratio (~450 ppi density)

Android 14

Android 16, OriginOS 6

Mediatek Dimensity 6300 (6 nm)

Mediatek Dimensity 7300e (6 nm)

Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)

Octa-core (4x2.5 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)

Mali-G57 MC2

Mali-G610

8GB

6GB/8GB

256GB

128GB

microSDXC (dedicated slot)

64 MP, f/1.9, (wide), 0.8µm, PDAF

50 MP, f/1.8, (wide), 1/2.93", PDAF

25 MP, f/1.8, (night vision), 2 infrared lights

Auxiliary lens

2 MP, (macro)

LED flash, HDR, panorama

LED flash, HDR, panorama

1440p@30fps, 1080p@30fps

Yes

16 MP, f/2.3, (wide), 1.0µm

32 MP, f/2.0, 22mm (wide)

1080p@30fps

1080p@30fps

Li-Po 6050 mAh

Si/C Li-Ion 10000 mAh

18W wired

44W wired Reverse wired

Fingerprint (side-mounted), accelerometer, gyro, proximity, compass

Fingerprint (under display, optical), accelerometer, gyro, proximity, compass

Yes

Yes, with stereo speakers

Yes

Wi-Fi 802.11 a/b/g/n/ac, dual-band

Yes

5.2, A2DP, LE

5.4, A2DP, LE

GPS, GLONASS, GALILEO, BDS

GPS, GALILEO, GLONASS, QZSS, BDS

Yes

Wireless FM radio

USB Type-C 2.0

USB Type-C 2.0, OTG