Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) vs Sony Xperia U (ST25i)
Side by side comparison between Asus Zenfone 4 vs Sony Xperia U phones, differences, pros, cons and full specifications. What's the better?
,
5.5"
IPS
IPS
1080x1920
12.2
MP
MP
8mp
6GB
RAM
RAM
Octa-core
3300
mAh
mAh
(Non removable)
vs
3.5"
LED
LED
480x854
5
MP
MP
0.3mp
512MB
RAM
RAM
Dual-core
1320
mAh
mAh
(Removable)
What's the better phone? Asus Zenfone 4 (ZE554KL 64GB/6GB NFC)
The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!
28 Advantages 
3 Advantages | 19 Common items in both devices |
| 16 million |
| LED flash |
| Only digital zoom |
| PDAF: phase detection autofocus / Autofocus |
| Capacitive |
| Multitouch |
| Accelerometer |
| +12 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Model | Zenfone 4 (ZE554KL 64GB/6GB NFC) | Xperia U (ST25i) |
| Other model names | Asus Zenfone 4 (NFC version) Snapdragon 660 (6GB RAM) | Sony Xperia U ST25, Sony Kumquat |
| Country or region available |       (Europe), South Africa, China, USA, Hong Kong, Taiwan |  (Global, International) |
| Brand | Asus | Sony |
| Release date | 10/1/2017 | 5/7/2012, Announced: 2/1/2012 |
| Depth | 7.5 millimeters (0.3 inches) | 12 millimeters (0.47 inches) |
| Size (width x height) | 75.2 x 155.4 millimeters (2.96 x 6.12 in) | 54 x 112 millimeters (2.13 x 4.41 in) |
| Weight | 165 grams (5.78 ounces) | 110 grams (3.85 ounces) |
| Build, materials | Aluminum frame, glass front/back | Plastic body, glass front |
| Protection against water and others | Not supported | Not supported |
📲 Display | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Display type | TFT IPS LCD | TFT LED-Backlit LCD |
| Screen size | 5.5" inches | 3.5" inches |
| Screen-to-body ratio | ~71.4% (screen-to-body ratio) | ~55.8% (screen-to-body ratio) |
| Display resolution | 1080x1920 pixels | 480x854 pixels (16:9) |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch 4-points |
| Pixel density (dot pitch) | 401 PPI | 280 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass 3 | Scratch-resistant glass |
| Refresh rate | feature not registered | 60Hz |
| Display features | feature not registered | Not supported |
🤖 Operating System | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| System version | Android 7.1.1 Nougat | Android 2.3.7 Gingerbread |
| Firmware update | feature not registered | Android 4.0.4 Ice Cream Sandwich ICS |
| User Interface | feature not registered | feature not registered |
⚙️ Processor | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Chipset | 64bit: Qualcomm Snapdragon 660 SDM660 (14nm) | 32bit: ST-Ericsson NovaThor U8500 (45nm) |
| CPU | Octa-core, 2 processors: 4x 2.2GHz Kryo 260 Gold (Quad-core) 4x 1.8GHz Kryo 260 Silver (Quad-core) | Dual-core, 1 processor: 2x 1GHz ARM Cortex-A9 (Dual-core) |
| GPU graphical controller | Qualcomm Adreno 512 650Mhz | ARM Mali-400 MP1 |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| RAM memory | 6GB LPDDR4X | 512MB LPDDR2 |
| Internal storage | 64GB (52GB available) | 8GB (4GB available) |
| External storage | Until 256GB microSD, microSDXC (hybrid slot/shares the same SIM-2 slot) | Not supported |
📶 Mobile networks | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card (hybrid slot/shares the same microSD slot) | Not supported |
| SIM card | 2 slots (Dual-SIM) nano-SIM (4FF) | 1 slot (Single-SIM) Standard mini-SIM (2FF) |
| Maximum Download / Upload | 600/150 Mbps | 14.4/5.76 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G |
| Frequency, bands | Expand band details Collapse details | |
| GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
| Primary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Primary 3G network | China version: UMTS 850/900/1900/2100 North America version: UMTS 800/850/900/1700/1900/2100 Taiwan version: UMTS 800/850/900/1800/1900/2100 | UMTS 900/2100 |
| Primary 4G network | LTE Cat12 China version: LTE (Bands 1,2,3,5,7,8) TD-LTE (Bands 34,38,39,40,41) North America version: LTE (Bands 1,2,3,4,5,7,8,12,17,28) Taiwan version: LTE (Bands 1,2,3,5,7,8,18,19,28) TD-LTE (Bands 38,39,40,41) | Not supported |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A | GPRS, EDGE, UMTS, HSDPA, HSUPA |
| Secondary 2G network | GSM 850/900/1800/1900 | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | GPRS, EDGE | Not supported |
📷 Camera | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Back camera (main camera) | (dual camera) 12.2 megapixels 8MP 12mm | 5 megapixels |
| Main camera resolution | 4032x3024 pixels | 2592x1944 pixels |
| Video recording (primary) | 4K UHD (3840x2160) 30 fps | HD (1280x720) 30 fps |
| Flash | LED flash | LED flash |
| Focal aperture | f/1.8 (aperture) | feature not registered |
| Focal length | 25mm (lens) | feature not registered |
| Sensor size | 1/2.55" inches | feature not registered |
| Pixel size | 1.4µm pixel | feature not registered |
| Autofocus | PDAF: phase detection autofocus | Autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | OIS (4-axis): Optical stabilization | EIS: Digital stabilization |
| Zoom | Only digital zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Not supported | Not supported |
| HDR | HDR photo on both cameras | Not supported |
| Camera extras | feature not registered | feature not registered |
📸 Front camera | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Front camera (secondary) | 8 megapixels | 0.3 megapixels |
| Front camera resolution | 3264x2448 pixels | 640x480 pixels |
| Video recording (secondary) | Full HD (1920x1080) | VGA (640x480) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.0 (aperture) | feature not registered |
| Focal length | 24mm (lens) | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
🔉 Sound and multimedia | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Loudspeaker | Supported | Supported |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM | FM (RDS) |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263 | MP4, H.263, H.264, WMV |
| Audio formats | MP3, WAV, OGG, eAAC+ | MP3, eAAC+, WMA, WAV |
🔌 Connectivity | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| USB | USB 2.0 Type-C reversible connector | MicroUSB 2.0, USB OTG On-The-Go |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | Not supported | Not supported |
| Bluetooth | 5.0 + A2DP/LE | 2.1 + A2DP |
| WiFi | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot | 802.11 b/g/n [wifi4] (2.4GHz) |
| DLNA | Not supported | Supported |
| GPS | A-GPS, GeoTagging, GLONASS, BeiDou | A-GPS, GeoTagging |
| NFC | Supported | Not supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor Gyroscope Hall effect Proximity sensor | Accelerometer Ambient light sensor Compass Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Battery type | LiPo: li-ion polymer (Non removable) | Li-Ion: lithium-ion (Removable) BA600 |
| Battery capacity | 3300 mAh | 1320 mAh |
| Charger, watts | 18W (9V/2A) Wired fast charging | Wired charging |
| Inductive / wireless charging | feature not registered | Not supported |
| Talk time autonomy | 30 hours (1.3 days) | 5.6 hours |
| Standby | 552 hours (23 days) | 472 hours (19.7 days) |
➕ Other features | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| Call control | Voice dialing, Voice recorder | Voice dialing, Voice recorder, Voice commands |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported | Supported |
| Video calling | Supported | Supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | HTML, XHTML, HTML5 | HTML, XHTML, Flash player |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Moonlight white, Mint green, Midnight black • Asus ZenUI 4.0 • 2.5D glass screen • Sony IMX362 back camera sensor • Fast battery charging: 50% in 36min • 24-bit/192kHz audio • DTS surround sound • VoLTE | • Colors: Black, White • Exchangeable bottom caps: White, Black, Pink, Yellow • Sony Reality Display • Sony Mobile BRAVIA Engine • xLoud • 3D surround sound • WiFi hotspot • Java framework |
☢️ Radiation rate | ||
| Asus Zenfone 4 (ZE554KL 64GB/6GB NFC) | Sony Xperia U (ST25i) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 1.09W/kg (head), 0.93W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | 1.62W/kg (head) |