vivo X21i vs Samsung Galaxy J7 Duo
vivo X21i
Samsung Galaxy J7 Duo
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Network
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2G networkGSM 850, 900, 1800, 1900; CDMA 800 & TD-SCDMAGSM 850, 900, 1800, 1900
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3G networkHSDPA 850, 900, 2100HSDPA 850, 900, 1900, 2100
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4G networkLTE frequency band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)LTE frequency band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 38(2600), 40(2300), 41(2500)
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HSPA speedHSPA-
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LTE speedLTELTE, Cat4, 150 Mbps download, 50 Mbps upload
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GPRSYesYes
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EDGEYesYes
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Availability
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Oficially announced2018-52018-4
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Status2018-52018-4
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Design
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BuildAluminium alloy, glassMetal
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SIMHybrid Dual SIM (Nano-SIM, dual stand-by)Single SIM (Micro-SIM) or Dual SIM (Micro-SIM, dual stand-by)
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Height154.4 mm153.5 mm
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Width75 mm77.2 mm
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Thickness7 mm8.2 mm
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Weight159 g174 g
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ColorsAurora White, Black, Ruby RedBlack, Gold, Rose Gold, White
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Display
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Display typeSuper AMOLED capacitive touchscreenSuper AMOLED capacitive touchscreen
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Physical size6.28 inches5.5 inches
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Resolution1080 x 2280 pixels720 x 1280 pixels
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Pixel density402 ppi267 ppi
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Display colors1677721616777216
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Protection-2.5D curved glass screen
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MultitouchYesYes
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Hardware
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CPUOcta-coreOcta-core
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CPUQuad-core 2 GHz Cortex-A73Dual-core 2.2 GHz Cortex-A73
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CPU(second)quad-core 2 GHz Cortex-A53Hexa-core 1.6 GHz Cortex-A53
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ChipsetMediatek MT6771 Helio P60Exynos 7885 Octa
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GPUMali-G72 MP3Mali-G71
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Memory RAM4, 6 GB4 GB
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Internal storage64, 128 GB32 GB
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Memory cardmicroSD(uses second SIM slot)microSD
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Memory card max256 GB256 GB
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OS
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OSAndroid 8.1 (Oreo)Android 8.0 (Oreo)
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Main camera
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Camera typeDualDual
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Main camera12 MP, f/1.8 , 1/2.5" , 1.4 µm13 MP, f/1.9
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5 MP, f/2.45 MP, f/1.9
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Primary camera resolution4032 x 3024 pixels4160 x 3120 pixels
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Primary camera video1080p@30fps1080p@30fps
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Primary camera Autofocusdual pixel phase detection autofocusautofocus
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Primary camera flashLED flashLED flash
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Camera featuresGeo-tagging, HDR, face detection, panorama, touch focusGeo-tagging, HDR, face detection, panorama, touch focus
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Selfie camera
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Flash-LED flash
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Selfie camera24 MP8 MP, f/1.9
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Selfie camera resolution5632 x 4224 pixels3264 x 2448 pixels
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Selfie camera video1080p@30fps720p@30fps
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Sound
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3.5mm jackYesYes
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LoudspeakerYesYes
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NotificationsVibration; MP3, WAV ringtonesVibration; MP3, WAV ringtones
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EarpieceYesYes
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Multimedia
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Radio FMFM radioFM radio
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Connectivity
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WLANWi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11acWi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac
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WLAN WiFi HotspotYesYes
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WLAN WiFi DirectYesYes
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WLAN WiFi Dual BandYesYes
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USBmicroUSB 2.0Yes
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USB On-The-GoYes-
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Bluetoothv5.0v4.2
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Bluetooth A2DPYesYes
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bluetooth LEYesYes
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GPSYes, with A-GPSYes, with A-GPS
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GLONASSYesYes
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BDS-Yes
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Features
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Messaging SMSSMS(threaded view)SMS(threaded view)
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Messaging MMSMMSMMS
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Messaging EmailEmailEmail
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Messaging IM-IM
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Messaging Push EmailPush EmailPush Email
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SensorsFingerprint (rear-mounted), accelerometer, compass, proximityFingerprint (front-mounted), accelerometer, proximity
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Browser
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HTMLHTML5HTML5
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Battery
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Battery typeLi-IonLi-Ion
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Battery capacity3425 mAh3000 mAh
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Battery removableNon-removableRemovable
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Fast battery chargingYes-