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Brief information about compared phones: Asus Zenfone 4 Pro ZS551KL , vivo X21iAsus Zenfone 4 Pro ZS551KL 2017 year of release, cpu Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo), screen 5.5", with resolution 1080x1920. Smartphone has 8 megapixel front camera and 12 megapixel main camera. vivo X21i 2018 year of release, cpu Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53), screen 6.28", with resolution 1080x2280. Smartphone has 24 megapixel front camera and 12 megapixel main camera. |
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| Display | Technology | AMOLED | Super AMOLED | |
| Touchscreen | capacitive touchscreen | capacitive touchscreen | ||
| Display colors | 16M | 16M | ||
| Screen size | 5.5" inch | 6.28" inch | ||
| Screen area | 83.4 cm2 | 98.4 cm2 | ||
| Screen format | 16:9 (height:width) | 19:9 (height:width) | ||
| Screen to body ratio | 70.3% | 85.0% | ||
| Screen resolution | 1080 x 1920 px | 1080 x 2280 px | ||
| PPI /points per inch/ | 401 PPI | 402 PPI | ||
| Screen protection | Corning Gorilla Glass 5 | |||
| Camera and Video | Rear camera, main | 12 MP, Dual | 12 MP, Dual | |
| Camera specs | 12 MP, f/1.7, 25mm (wide), 1/2.55'', 1.4µm, 4-axis OIS, dual pixel PDAF & laser AF -16 MP, 50mm (telephoto), 1/3.1'', 1.0µm, 2x optical zoom, AF | 12 MP, f/1.8, 1/2.55'', 1.4µm, dual pixel PDAF -5 MP, f/2.0, depth sensor | ||
| Functions | HDR | LED flash, HDR, panorama | ||
| Video | 1080p@30fps | 1080p@30fps | ||
| Front camera, selfie | 8 MP, Single | 24 MP, Single | ||
| Specifications | 8 MP, f/1.9, 1/3.2'', 22mm (wide), 1.4µm, PDAF | 24 MP | ||
| Performance | Operating system OS | Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo); ZenUI 4 | Android 8.1 (Oreo); Funtouch 4 | |
| Chipset | Qualcomm MSM8998 Snapdragon 835 (10 nm) | Mediatek MT6771 Helio P60 (12 nm) | ||
| Processor CPU | Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo) | Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) | ||
| Graphics processor GPU | Adreno 540 | Mali-G72 MP3 | ||
| External memory | microSD, up to 512 GB (uses SIM 2 slot) | microSD, up to 256 GB (uses SIM 2 slot) | ||
| Internal memory | 64/128 GB, 6 GB RAM | 128 GB, 4 GB RAM 64 GB, 6 GB RAM | ||
| Antutu 7 score | 130256 | |||
| GeekBench 4 Single Core | 1497 | |||
| GeekBench 4 Multi-Core | 5759 | |||
| General specs | Release date | 2017, August | 2018, May | |
| Dimensions (HxWxD) | 156.9 Х 75.6 Х 7.6 mm | 154.4 Х 75 Х 7 mm | ||
| Weight | 175 g | 159 g | ||
| Colors | Moonlight White, Pure Black | Black, Aurora White, Ruby Red, Night Purple | ||
| Battery | 3600 mAh, Non-removable Li-Ion | 3425 mAh, Non-removable Li-Ion | ||
| Approximate price | 390 EUR | 430 EUR | ||
| Battery life | Talking time- Up to 27 h 30 min (3G) | |||
| Body build | Front/back glass (Gorilla Glass 5) & aluminum frame | |||
| Communication and Connectivity | SIM card | Hybrid Dual SIM (Nano-SIM, dual stand-by) | Hybrid Dual SIM (Nano-SIM, dual stand-by) | |
| Network | Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100 -4G - LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 17(700), 19(800), 20(800), 28(700), 38(2600), 39(1900), 40(2300), 41(2500) - Global, Taiwan LTE band 1(2100), 12(700), 18(800), 26(850), 29(700), 30(2300), 41(2500) - US, Canada, Brazil LTE band 1(2100), 41(2500) - India | Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMA -3G - HSDPA 850 / 900 / 2100 -4G - LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500) | ||
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (3CA) Cat12 600/150 or 100 Mbps | HSPA, LTE | ||
| GPRS | Yes | Yes | ||
| Edge | Yes | Yes | ||
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot | ||
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS, GLONASS | ||
| NFC | Yes | |||
| USB | Type-C 1.0 reversible connector | microUSB 2.0, USB On-The-Go | ||
| Bluetooth | 5.0, A2DP, EDR, LE, aptX | 5.0, A2DP, LE | ||
| Music and Audio | Radio | FM radio | FM radio | |
| Headphone jack | Yes | Yes | ||
| Others | 24-bit/192kHz audio -DTS sound -Active noise cancellation with dedicated mic | 32-bit/192kHz audio -Active noise cancellation with dedicated mic | ||
| Other features | Dop | Sensors Fingerprint (front-mounted), accelerometer, gyro, proximity, compass, color spectrum , Infrared port - Fast battery charging: 50% in 32 min | Sensors Fingerprint (rear-mounted), accelerometer, proximity, compass - Fast battery charging | |
