Phone Comparison - Sony Xperia Z Ultra vs Asus PadFone X vs Xiaomi Mi 4i
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| Manufacturer | Sony | Asus | Xiaomi |
| Announced | June 2013 | March 2014 | April 2015 |
| Status | Available - July 2013 | Coming Soon - Q2 2014 | Available - April 2015 |
| Price | - | - | Rs. 8,999 ($132.34) [Similarly Priced] |
| Colors | Black, White, Purple | Titanium Black, Platinum White | Black, White, Blue, Yellow, Pink |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
179.4 x 92.2 x 6.5 mm (7.06 x 3.63 x 0.26 in) |
143.4 x 72.5 x 10 mm (5.65 x 2.85 x 0.39 in) |
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in) |
| Weight | 212 g (7.48 oz) | 150 g (5.29 oz) | 130 g (4.59 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - All Versions | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1700 / 1900 / 2100 - All Versions | HSDPA | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE 700 / 850 / 1700 / 1900 / 2100 / 2600 / 900 - C6806 | LTE | LTE |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
| Build Features | - IP58 Certified - Dust and Water-proof - Water Resistant up to 1 Meter and 30 Minutes |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.4.2 (KitKat) | Android OS, v5.0 (Lollipop) |
| Processor | Quad-core 2.2 GHz Krait 400, Qualcomm MSM8274/MSM8974 Snapdragon 800 | Quad-core 2.3 GHz Krait 400, Qualcomm Snapdragon 800 | Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 |
| GPU | Adreno 330 | Adreno 330 | Adreno 405 |
| RAM | 2 GB | 2 GB | 2 GB |
| Internal Memory | 16 GB | 16 GB | 16/32 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 64 GB | No |
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| Type | Capacitive touchscreen | Super IPS+ LCD capacitive touchscreen | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 6.44 inches | 5.0 inches | 5.0 inches |
| Resolution | 1080 x 1920 pixels (342 ppi) | 1080 x 1920 pixels (441 ppi) | 1080 x 1920 pixels (441 ppi) |
| Screen-to-Body Ratio | 69.15% | 66.16% | 71.57% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Stereo FM radio with RDS | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264 x 2448 pixels | 13 MP, 4128 x 3096 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face Detection, Image Stabilization, HDR, Sweep Panorama | Auto focus, Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR |
| Video | Yes, 1080p@30fps, video stabilization, HDR | Yes, 1080p@30fps | 1080p@30fps |
| Front Camera | Yes, 2 MP, 1080p@30fps [Similar] | Yes, 2 MP, 1080p@30fps [Similar] | 5 MP [Similar] |
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| GPRS | Up to 107 kbps | Yes | Yes |
| Edge | Up to 296 kbps | Yes | Yes |
| 3G | HSDPA, 42 Mbps; HSUPA, 5.8 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | DC-HSPA+, 42 Mbps; HSDPA, 21 Mbps; HSUPA, 5.76 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | HSPA, LTE |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v4.0 with A2DP | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, dual-band, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n, dual-band, hotspot |
| USB | Yes, microUSB v2.0 (MHL), USB On-the-go | Yes, microUSB v2.0 (SlimPort), USB Host | microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS support | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16 GB, 2 GB RAM | 16 GB, 2 GB RAM | 16/32 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 64 GB | No |
| USB OTG | Supported | Supported | - |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | Non-removable Li-Ion Battery | Non-removable Li-Po Battery | Li-Po Battery |
| Capacity | 3050 mAh | 2300 mAh | 3120 mAh |
| Stand by | Up to 790 h (2G) Up to 820 h (3G) |
- | - |
| Talk Time | Up to 14 h (2G) Up to 16 h (3G) |
- | - |
