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Our Verdict
Analysis
Infinix Note 40S has the bigger display.
Overall Winner
Infinix Note 40S
Display Winner
Infinix Note 40S
Performance Winner
Tie
Camera Winner
Tie
Battery Winner
Tie
Value Winner
Tie
Specifications Comparison
| Feature | Infinix Note 40S | Xiaomi 15 Ultra |
|---|---|---|
| Display size (in) | 6.78 | 6.73 |
| Charging (W) | 33 | 90 |
| Main camera (MP) | 108.00 | 50.00 |
| Weight (g) | 176 | 226 |
| Thickness (mm) | 7.80 | 9.35 |
| Chipset | Mediatek Helio G99 Ultimate | Snapdragon 8 Elite |
| OS | Android 14, up to 2 major Android upgrades, XOS 14 | Android 15, HyperOS 2 |
Pros & Cons
Infinix Note 40S
Xiaomi 15 Ultra
- Outstanding camera versatility
- Fast wired and wireless charging
- Bright display
- Heavy
- Software still polishing animations
- Limited availability in some regions
Every Spec, Side by Side
Specification
Infinix
Infinix Note 40S
Xiaomi
Xiaomi 15 Ultra
Battery 3 specs
Type
5000 mAh
Market-dependent versions:· Si/C Li-Ion 5410 mAh - Global· Si/C Li-Ion 6000 mAh - China
Charging
33W wired, 50% in 31 min
20W wireless MagCharge
Reverse wired
Reverse wireless
Bypass charging
90W wired, 80W wireless
Capacity
—
5410 mAh
Body 5 specs
Dimensions
164.1 x 74.6 x 7.8 mm (6.46 x 2.94 x 0.31 in)
161.3 x 75.3 x 9.35 mm
Weight
176 g (6.21 oz)
226 g
SIM
Nano-SIM + Nano-SIM
· Nano-SIM + Nano-SIM· Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time)
IP54 dust protected and water resistant (water splashes)
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
Aerospace-grade glass fiber
Build
—
Glass front, glass-fiber reinforced plastic back or silicone polymer back (eco leather), aluminum frame
Connectivity 8 specs
WLAN
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Wi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band or tri-band, Wi-Fi Direct
Bluetooth
Yes
6.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 5
Positioning
GPS
GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS
NFC
Yes (market/region dependent)
Yes
Radio
FM radio
No
USB
USB Type-C 2.0, OTG
USB Type-C 3.2 Gen 2, DisplayPort, OTG
Infrared port
—
Yes
5G
—
Yes
Display 4 specs
Type
AMOLED, 1B colors, 120Hz, 550 nits (typ), 1300 nits (peak)
LTPO AMOLED
Size
6.78 inches, 109.9 cm2 (~89.8% screen-to-body ratio)
6.73 inches
Resolution
1080 x 2436 pixels (~393 ppi density)
1440 x 3200 pixels
Protection
Corning Gorilla Glass
Xiaomi Shield Glass 2.0, Mohs level 6
Features 2 specs
Sensors
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometer
—
Two-way satellite communication (China model only)
Launch 2 specs
Announced
2024, September
2025, February 27
Status
Available. Released 2024, October
Available. Released 2025, February 27
Main Camera 4 specs
Triple
108 MP, f/1.9, 24mm (wide), 1/1.52", PDAF
2 MP (macro)
3rd unspecified camera
—
Features
Quad-LED flash, HDR, panorama
Laser AF, color spectrum sensor, Leica lenses, Dual-LED flash, HDR, panorama, 67mm filter ring holder (optional)
Video
1440p@30fps, 1080p@30/60fps
8K@30fps, 4K@30/60/120fps, 1080p@30/60/120/240/480/960/1920fps, gyro-EIS, Dolby Vision HDR 10-bit rec. (4K@60fps, 1080p)
Quad
—
50 MP + 50 MP + 200 MP + 50 MP
Memory 5 specs
Card slot
Unspecified
No
Internal
256GB 8GB RAM
256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
UFS 2.2
UFS 4.1
RAM
—
16GB
Storage
—
512GB
Misc 4 specs
Colors
Obsidian Black, Vintage Green
Black, White, Silver Chrome, Green
Models
X6850B
25010PN30G
SAR EU
—
1.00 W/kg (head) 1.00 W/kg (body)
Price
—
$ 693.75 / £ 1,295.00 / € 812.34
Network 7 specs
Technology
GSM / HSPA / LTE
GSM / HSPA / LTE / 5G
2G bands
GSM 850 / 900 / 1800 / 1900
GSM 850 / 900 / 1800 / 1900
3G bands
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40, 41
1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 42, 48, 66, 71 - International
Speed
HSPA, LTE
HSPA, LTE, 5G
—
1, 2, 3, 5, 7, 8, 12, 20, 26, 28, 38, 40, 41, 48, 66, 77, 78, 79, 80, 81, 83, 84, 89 SA/NSA - China
5G bands
—
1, 2, 3, 5, 7, 8, 12, 20, 25, 26, 28, 38, 40, 41, 48, 66, 71, 75, 77, 78, 79 SA/NSA - International
Platform 4 specs
OS
Android 14, up to 2 major Android upgrades, XOS 14
Android 15, HyperOS 2
Chipset
Mediatek Helio G99 Ultimate
Snapdragon 8 Elite
CPU
Octa-core (2x2.2 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)
Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M)
GPU
Mali-G57 MC2
Adreno 830
Selfie Camera 3 specs
Single
32 MP, f/2.2, (wide), 1/3.1"
32 MP
Features
Dual-LED flash
HDR, panorama
Video
1080p@30fps
4K@30/60fps, 1080p@30/60fps, gyro-EIS
Sound 3 specs
Loudspeaker
Yes, with stereo speakers
Yes, with stereo speakers
3.5mm jack
No
No
Tuned by JBL
24-bit/192kHz Hi-Res audio
24-bit/192kHz Hi-Res & Hi-Res Wireless audio
Qualcomm XPAN (24-bit/96kHz audio)
Eu Label 4 specs
Energy
—
Class A
Battery
—
58:58h endurance, 1000 cycles
Free fall
—
Class C (90 falls)
Repairability
—
Class C
Our Tests 2 specs
Loudspeaker
—
-24.1 LUFS (Very good)
Battery
—
Active use score 16:13h
Similar Comparisons
Common Questions
Which phone is the best in this comparison?
Infinix Note 40S has the bigger display.
How are the comparison winners decided?
We compare measurable specs (display size, battery capacity, RAM, charging, weight) and price (USD). When two phones tie or data is missing we mark the category "Depends".
Which is more affordable?
The cheaper option is shown as the value winner above. Prices are USD and may vary by region or retailer.