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Compare features, prices and ratings to find the perfect phone for you.
Our Verdict
Analysis
Xiaomi 15 Ultra has the bigger display.
Overall Winner
Xiaomi 15 Ultra
Display Winner
Xiaomi 15 Ultra
Performance Winner
Tie
Camera Winner
Tie
Battery Winner
Tie
Value Winner
Tie
Specifications Comparison
| Feature | Acer M900 | Xiaomi 15 Ultra |
|---|---|---|
| Display size (in) | 3.80 | 6.73 |
| Main camera (MP) | 5.00 | 50.00 |
| Weight (g) | 188 | 226 |
| Thickness (mm) | 17.10 | 9.35 |
| OS | Microsoft Windows Mobile 6.1 Professional | Android 15, HyperOS 2 |
Pros & Cons
Acer M900
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
Acer
Acer M900
Xiaomi
Xiaomi 15 Ultra
Battery 5 specs
Type
Removable Li-Ion 1530 mAh battery
Market-dependent versions:· Si/C Li-Ion 5410 mAh - Global· Si/C Li-Ion 6000 mAh - China
Stand-by
Up to 470 h
—
Talk time
Up to 4 h
—
Capacity
—
5410 mAh
Charging
—
90W wired, 80W wireless
Body 6 specs
Dimensions
119 x 62 x 17.1 mm (4.69 x 2.44 x 0.67 in)
161.3 x 75.3 x 9.35 mm
Weight
188 g (6.63 oz)
226 g
Keyboard
QWERTY
—
SIM
Mini-SIM
· Nano-SIM + Nano-SIM· Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time)
Build
—
Glass front, glass-fiber reinforced plastic back or silicone polymer back (eco leather), aluminum frame
—
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
Aerospace-grade glass fiber
Connectivity 8 specs
WLAN
Wi-Fi 802.11 b/g
Wi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band or tri-band, Wi-Fi Direct
Bluetooth
2.0, A2DP
6.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 5
Positioning
GPS, SiRF Star III chipset
GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS
Radio
FM radio
No
USB
miniUSB
USB Type-C 3.2 Gen 2, DisplayPort, OTG
Infrared port
—
Yes
5G
—
Yes
NFC
—
Yes
Display 5 specs
Type
TFT resistive touchscreen, 65K colors
LTPO AMOLED
Size
3.8 inches, 41.1 cm2 (~55.7% screen-to-body ratio)
6.73 inches
Resolution
480 x 800 pixels, 5:3 ratio (~246 ppi density)
1440 x 3200 pixels
Widget-based UI
Handwriting recognition
—
Protection
—
Xiaomi Shield Glass 2.0, Mohs level 6
Features 3 specs
Sensors
Fingerprint (front-mounted)
Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometer
Browser
HTML
—
Pocket Office
Voice memo
MP3 player
Predictive text input
Two-way satellite communication (China model only)
Launch 2 specs
Announced
2009, February. Released 2009, June
2025, February 27
Status
Discontinued
Available. Released 2025, February 27
Main Camera 4 specs
Single
5 MP, AF
—
Features
LED flash
Laser AF, color spectrum sensor, Leica lenses, Dual-LED flash, HDR, panorama, 67mm filter ring holder (optional)
Video
Yes
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
microSD (dedicated slot)
No
Internal
—
256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
—
UFS 4.1
RAM
—
16GB
Storage
—
512GB
Misc 5 specs
Colors
Black
Black, White, Silver Chrome, Green
SAR
0.43 W/kg (head) 0.92 W/kg (body)
—
Price
About 250 EUR
$ 693.75 / £ 1,295.00 / € 812.34
Models
—
25010PN30G
SAR EU
—
1.00 W/kg (head) 1.00 W/kg (body)
Network 7 specs
Technology
GSM / HSPA
GSM / HSPA / LTE / 5G
2G bands
GSM 850 / 900 / 1800 / 1900
GSM 850 / 900 / 1800 / 1900
3G bands
HSDPA 850 / 1900 / 2100
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
Speed
HSPA 7.2/2 Mbps
HSPA, LTE, 5G
4G bands
—
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
—
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
Microsoft Windows Mobile 6.1 Professional
Android 15, HyperOS 2
CPU
533 MHz Samsung S3C 6410
Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M)
GPU
—
Adreno 830
Chipset
—
Snapdragon 8 Elite
Selfie Camera 3 specs
Single
VGA videocall camera
32 MP
Features
—
HDR, panorama
Video
—
4K@30/60fps, 1080p@30/60fps, gyro-EIS
Sound 3 specs
Loudspeaker
Yes
Yes, with stereo speakers
3.5mm jack
No
No
—
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?
Xiaomi 15 Ultra 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.