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Oppo A31

Xiaomi Redmi 9

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Oppo A31
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Oppo A31

Xiaomi Redmi 9

Network
Technology GSM / HSPA / LTE GSM / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 850 / 900 / 2100 - International HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
  HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - USA
4G Network 1, 3, 5, 7, 8, 20, 28, 38, 40, 41 - International 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40, 41
  1, 2, 3, 4, 5, 7, 8, 28, 38, 41, 66 - USA
  1, 3, 5, 8, 38, 40, 41 - India
  1, 3, 5, 7, 8, 38, 40, 41 - Asia
Speed HSPA, LTE HSPA, LTE
Launch
Announced 2020, February 13 2020, June 10
Status Available. Released 2020, February 14 Available. Released 2020, June 10
Body
Dimensions 163.9 x 75.5 x 8.3 mm (6.45 x 2.97 x 0.33 in) 163.3 x 77 x 9.1 mm (6.43 x 3.03 x 0.36 in)
3D size compare
Weight 180 g (6.35 oz) 198 g (6.98 oz)
Build Glass front (Gorilla Glass 3), plastic back, plastic frame Glass front (Gorilla Glass 3), plastic back, plastic frame
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Display
Type IPS LCD, 480 nits (typ) IPS LCD, 400 nits (typ)
Size 6.5 inches, 102.0 cm2 (~82.4% screen-to-body ratio) 6.53 inches, 104.7 cm2 (~83.2% screen-to-body ratio)
Resolution 720 x 1600 pixels, 20:9 ratio (~270 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~395 ppi density)
Protection Corning Gorilla Glass 3 Corning Gorilla Glass 3
Platform
OS Android 9.0 (Pie), ColorOS 6.1 Android 10, upgradable to Android 12, MIUI 13
Chipset Mediatek MT6765V/CB Helio P35 (12 nm) Mediatek MT6769V/CU Helio G80 (12 nm)
CPU Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) Octa-core (2x2.0 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55)
GPU PowerVR GE8320 Mali-G52 MC2
Memory
Card slot microSDXC (dedicated slot) microSDXC (dedicated slot)
Internal 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM 32GB 3GB RAM, 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM
 eMMC 5.1 eMMC 5.1
Main Camera
Modules 12 MP, f/1.8, (wide), 1/2.86", 1.25µm, PDAF
2 MP, f/2.4, (macro)
2 MP, f/2.4, (depth)
13 MP, f/2.2, 28mm (wide), 1/3.1", 1.12µm, PDAF
8 MP, f/2.2, 118˚ (ultrawide), 1/4.0", 1.12µm
5 MP, f/2.4, (macro)
2 MP, f/2.4, (depth)
Features LED flash, HDR, panorama LED flash, HDR, panorama
Video 1080p@30fps 1080p@30fps
Selfie Camera
Modules 8 MP, f/2.0, (wide), 1/4.0", 1.12µm 8 MP, f/2.0, 27mm (wide), 1/4.0", 1.12µm
Features HDR HDR
Video 1080p@30fps 1080p@30fps
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Sound
Loudspeaker Yes Yes
3.5mm jack Yes Yes
Comms
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth 5.0, A2DP, LE 5.0, A2DP, LE
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
NFC No Yes (market/region dependent)
Infrared port No Yes
Radio FM radio Wireless FM radio (no wired headphones required)
USB microUSB 2.0, OTG USB Type-C 2.0, OTG
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, proximity, compass
Battery
Type Li-Po 4230 mAh Li-Po 5020 mAh
Charging 18W wired
Misc
Colors Fantasy White, Mystery Black, Lake Green Carbon Gray, Sunset Purple, Ocean Green, Pink/Blue
SAR 0.91 W/kg (head)     1.00 W/kg (body)    
SAR EU 0.71 W/kg (head)     1.06 W/kg (body)    
Models CPH2015, CPH2073, CPH2081, CPH2029, CPH2031 M2004J19G, M2004J19C
Price ₹ 8,999 $ 79.99 / £ 74.98 / € 109.99 / ₹ 7,999
Tests
Performance AnTuTu: 201829 (v8)
GeekBench: 1325 (v5.1)
Display 1624:1 contrast ratio, 328 nits max brightness (measured)
Loudspeaker -26.9 LUFS (Good)
Battery (old) Endurance rating 131h

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