Screen size
P5503.5"
Zenfone 12 UltraWinner: 6.8"+48%
Quick verdict
Zenfone 12 Ultra leads the measured specs 20-3.
Measured wins
P550
3
spec wins
Ties
0
equal specs
Zenfone 12 Ultra
20
spec wins
Overall winner
Screen size
Technology
P550
GSM / UMTS
Zenfone 12 Ultra
GSM / HSPA / LTE / 5G
2G bands
P550
GSM 900 / 1800 / 1900
Zenfone 12 Ultra
GSM 850 / 900 / 1800 / 1900
3G bands
P550
UMTS 2100
Zenfone 12 Ultra
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
Speed
P550
Yes, 384 kbps
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
NFC
3.5mm jack
SD card
Stereo speakers
Zenfone 12 Ultra
HSPA, LTE, 5G
4G bands
P550
-
Zenfone 12 Ultra
1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28, 32, 34, 38, 39, 40, 41, 42, 43, 48, 66
5G bands
P550
-
Zenfone 12 Ultra
1, 2, 3, 5, 7, 8, 12, 18, 20, 25, 26, 28, 38, 40, 41, 48, 66, 77, 78, 79 SA/NSA
Announced
P550
2007, December. Released 2008
Zenfone 12 Ultra
2025, February 06
Status
P550
Discontinued
Zenfone 12 Ultra
Available. Released 2025, February 28
Dimensions
P550
121 x 70 x 16.5 mm (4.76 x 2.76 x 0.65 in)
Zenfone 12 Ultra
163.8 x 77 x 8.9 mm (6.45 x 3.03 x 0.35 in)
Weight
P550
188 g (6.63 oz)
Zenfone 12 Ultra
220 g (7.76 oz)
SIM
P550
Mini-SIM
Zenfone 12 Ultra
Nano-SIM + Nano-SIM + eSIM (max 2 at a time)
Build
P550
-
Zenfone 12 Ultra
Glass front (Gorilla Glass Victus 2), aluminum frame, glass back
Other
P550
-
Zenfone 12 Ultra
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
Type
P550
TFT resistive touchscreen, 65K colors
Zenfone 12 Ultra
LTPO AMOLED, 144Hz, HDR10, 1600 nits (HBM), 2500 nits (peak)
Size
P550
3.5 inches, 37.9 cm2 (~44.8% screen-to-body ratio)
Zenfone 12 Ultra
6.78 inches, 111.0 cm2 (~88.0% screen-to-body ratio)
Resolution
P550
240 x 320 pixels, 4:3 ratio (~114 ppi density)
Zenfone 12 Ultra
1080 x 2400 pixels, 20:9 ratio (~388 ppi density)
Protection
P550
-
Zenfone 12 Ultra
Corning Gorilla Glass Victus 2, Mohs level 6
OS
P550
Microsoft Windows Mobile 6.0 Professional
Zenfone 12 Ultra
Android 15, upgradable to Android 16, up to 2 major Android upgrades
CPU
P550
Marvell PXA270M 520 MHz
Zenfone 12 Ultra
Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M)
Chipset
P550
-
Zenfone 12 Ultra
Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm)
GPU
P550
-
Zenfone 12 Ultra
Adreno 830
Card slot
P550
miniSD, miniSDHC
Zenfone 12 Ultra
No
Internal
P550
256MB 64MB RAM
Zenfone 12 Ultra
256GB 12GB RAM, 512GB 16GB RAM
Other
P550
-
Zenfone 12 Ultra
UFS 4.0
Single
P550
2 MP
Zenfone 12 Ultra
-
Video
P550
Yes
Zenfone 12 Ultra
8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, 720p@480fps; gyro-EIS, HDR10+
Triple
P550
-
Zenfone 12 Ultra
50 MP, f/1.9, 24mm (wide), 1/1.56", 1.0µm, PDAF, gimbal OIS 32 MP, f/2.4, 65mm (telephoto), 1/3.2", 0.7µm, PDAF, OIS, 3x optical zoom 13 MP, f/2.2, 13mm, 120˚ (ultrawide), 1/3.0", 1.12µm
Features
P550
-
Zenfone 12 Ultra
LED flash, HDR, panorama
Other
P550
No
Zenfone 12 Ultra
-
Single
P550
-
Zenfone 12 Ultra
32 MP, f/2.5, 22mm (wide), 1/3.2", 0.7µm
Features
P550
-
Zenfone 12 Ultra
Panorama, HDR
Video
P550
-
Zenfone 12 Ultra
1080p@30fps
Loudspeaker
P550
No
Zenfone 12 Ultra
Yes, with stereo speakers
Alert types
P550
Vibration; Downloadable polyphonic, Midi, MP3 ringtones
Zenfone 12 Ultra
-
3.5mm jack
P550
No
Zenfone 12 Ultra
Yes
Other
P550
-
Zenfone 12 Ultra
32-bit/384kHz Hi-Res & Hi-Res wireless audio
WLAN
P550
Wi-Fi 802.11 b/g
Zenfone 12 Ultra
Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct
Bluetooth
P550
2.0
Zenfone 12 Ultra
5.4, A2DP, LE, aptX HD, aptX Adaptive, aptX Lossless
Positioning
P550
GPS, SiRF Star III chipset
Zenfone 12 Ultra
GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC, GLONASS
Radio
P550
No
Zenfone 12 Ultra
No
USB
P550
1.1
Zenfone 12 Ultra
USB Type-C
NFC
P550
-
Zenfone 12 Ultra
Yes
Sensors
P550
Zenfone 12 Ultra
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Browser
P550
WAP 2.0 / HTML (PocketIE)
Zenfone 12 Ultra
-
Other
P550
Pocket Office MP3/WMA/AAC/AAC+ player Organizer Voice memo
Zenfone 12 Ultra
-
Type
P550
Removable Li-Ion 1530 mAh battery
Zenfone 12 Ultra
5500 mAh
Stand-by
P550
Up to 350 h
Zenfone 12 Ultra
-
Talk time
P550
Up to 5 h
Zenfone 12 Ultra
-
Charging
P550
-
Zenfone 12 Ultra
65W wired, PD3.0, PPS, QC5, 100% in 39 min 15W wireless (Qi) 10W reverse wired
Colors
P550
Silver
Zenfone 12 Ultra
Ebony Black, Sakura White, Sage Green
Price
P550
About 220 EUR
Zenfone 12 Ultra
£ 1,739.00
Models
P550
-
Zenfone 12 Ultra
AI2501, AI2501H, I2501C, AI2501B