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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 | alcatel OT-818 | Xiaomi 15 Ultra |
|---|---|---|
| Display size (in) | 3.20 | 6.73 |
| Main camera (MP) | 2.00 | 50.00 |
| Weight (g) | 100 | 226 |
| Thickness (mm) | 12.30 | 9.35 |
Pros & Cons
alcatel OT-818
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
Alcatel
alcatel OT-818
Xiaomi
Xiaomi 15 Ultra
Battery 6 specs
Talk time
Up to 10 h
—
Music play
Up to 20 h
—
Type
Removable Li-Ion 1000 mAh battery
Market-dependent versions:· Si/C Li-Ion 5410 mAh - Global· Si/C Li-Ion 6000 mAh - China
Stand-by
Up to 600 h
—
Capacity
—
5410 mAh
Charging
—
90W wired, 80W wireless
Body 5 specs
Dimensions
110.5 x 53.4 x 12.3 mm (4.35 x 2.10 x 0.48 in)
161.3 x 75.3 x 9.35 mm
Weight
100.5 g (3.53 oz)
226 g
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
No
Wi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band or tri-band, Wi-Fi Direct
Bluetooth
2.1, A2DP
6.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 5
Positioning
No
GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS
Radio
Stereo FM radio, RDS
No
USB
microUSB 2.0
USB Type-C 3.2 Gen 2, DisplayPort, OTG
Infrared port
—
Yes
5G
—
Yes
NFC
—
Yes
Display 4 specs
Type
TFT resistive touchscreen, 256K colors
LTPO AMOLED
Size
3.2 inches, 29.1 cm2 (~49.4% screen-to-body ratio)
6.73 inches
Resolution
240 x 400 pixels, 5:3 ratio (~146 ppi density)
1440 x 3200 pixels
Protection
—
Xiaomi Shield Glass 2.0, Mohs level 6
Features 6 specs
Sensors
Accelerometer
Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometer
Messaging
SMS, MMS, Email, Push Email, IM
—
Browser
WAP 2.0/xHTML
—
Games
Yes
—
Java
Yes, MIDP 2.1
—
SNS integration
MP3/AAC+ player
MP4/H.264 player
Organizer
Voice memo
Predictive text input
Two-way satellite communication (China model only)
Launch 2 specs
Announced
2011, Q1. Released 2011, Q2
2025, February 27
Status
Discontinued
Available. Released 2025, February 27
Main Camera 4 specs
Single
2 MP
—
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)
Features
—
Laser AF, color spectrum sensor, Leica lenses, Dual-LED flash, HDR, panorama, 67mm filter ring holder (optional)
Quad
—
50 MP + 50 MP + 200 MP + 50 MP
Memory 7 specs
Card slot
microSDHC (dedicated slot)
No
Phonebook
Yes, Photocall
—
Call records
Yes
—
Internal
50MB
256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
—
UFS 4.1
RAM
—
16GB
Storage
—
512GB
Misc 4 specs
Colors
Steel Grey, Cyber blue, Mystery pink
Black, White, Silver Chrome, Green
Models
—
25010PN30G
SAR EU
—
1.00 W/kg (head) 1.00 W/kg (body)
Price
—
$ 693.75 / £ 1,295.00 / € 812.34
Network 9 specs
Technology
GSM
GSM / HSPA / LTE / 5G
2G bands
GSM 850 / 900 / 1800 / 1900
GSM 850 / 900 / 1800 / 1900
GPRS
Class 12
—
EDGE
Class 12
—
3G bands
—
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
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
Speed
—
HSPA, LTE, 5G
Platform 4 specs
CPU
208 MHz
Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M)
GPU
—
Adreno 830
OS
—
Android 15, HyperOS 2
Chipset
—
Snapdragon 8 Elite
Selfie Camera 4 specs
No
—
Features
—
HDR, panorama
Video
—
4K@30/60fps, 1080p@30/60fps, gyro-EIS
Single
—
32 MP
Sound 3 specs
Loudspeaker
Yes
Yes, with stereo speakers
3.5mm jack
Yes
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
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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.