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Oppo A31

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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 HSDPA 850 / 900 / 2100
4G Network 1, 3, 5, 7, 8, 20, 28, 38, 40, 41 - International 1, 2, 3, 4, 5, 7, 8, 20, 38, 40
  1, 2, 3, 4, 5, 7, 8, 28, 38, 41, 66 - USA 1, 3, 5, 8, 38, 40, 41
  1, 3, 5, 8, 38, 40, 41 - India
  1, 3, 5, 7, 8, 38, 40, 41 - Asia
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE (4CA) Cat12 600/50 Mbps
Launch
Announced 2020, February 13 2019, August 29. Released 2019, October 16
Status Available. Released 2020, February 14 Discontinued
Body
Dimensions 163.9 x 75.5 x 8.3 mm (6.45 x 2.97 x 0.33 in) 158.3 x 75.3 x 8.4 mm (6.23 x 2.96 x 0.33 in)
3D size compare
Weight 180 g (6.35 oz) 190 (6.70 oz)
Build Glass front (Gorilla Glass 3), plastic back, plastic frame Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Display
Type IPS LCD, 480 nits (typ) IPS LCD
Size 6.5 inches, 102.0 cm2 (~82.4% screen-to-body ratio) 6.3 inches, 97.4 cm2 (~81.7% screen-to-body ratio)
Resolution 720 x 1600 pixels, 20:9 ratio (~270 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~409 ppi density)
Protection Corning Gorilla Glass 3 Corning Gorilla Glass 5
Platform
OS Android 9.0 (Pie), ColorOS 6.1 Android 9.0 (Pie), upgradable to Android 11, MIUI 12.5
Chipset Mediatek MT6765V/CB Helio P35 (12 nm) Qualcomm SDM665 Snapdragon 665 (11 nm)
CPU Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) Octa-core (4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)
GPU PowerVR GE8320 Adreno 610
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, 64GB 6GB 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)		 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF
8 MP, f/2.2, 120˚ (ultrawide), 1/4.0", 1.12µm
2 MP, f/2.4, (macro)
2 MP, f/2.4, (depth)
Features LED flash, HDR, panorama LED flash, HDR, panorama
Video 1080p@30fps 4K@30fps, 1080p@30/60/120fps; gyro-EIS
Selfie Camera
Modules 8 MP, f/2.0, (wide), 1/4.0", 1.12µm 13 MP, f/2.0, (wide), 1/3.1", 1.12µm
Features HDR HDR, panorama
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 4.2, A2DP, LE
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
NFC No No
Infrared port No Yes
Radio FM radio FM radio
USB microUSB 2.0, OTG USB Type-C 2.0, OTG
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Battery
Type Li-Po 4230 mAh Li-Po 4000 mAh, non-removable
Charging 18W wired
Misc
Colors Fantasy White, Mystery Black, Lake Green Neptune Blue, Moonlight White, Space Black, Nebula Purple, Cosmic Purple
SAR 0.26 W/kg (head)     1.00 W/kg (body)    
SAR EU 0.19 W/kg (head)     1.09 W/kg (body)    
Models CPH2015, CPH2073, CPH2081, CPH2029, CPH2031 M1908C3JH, M1908C3JG, M1908C3JI
Price $ 68.82 About 220 EUR
Tests
Performance AnTuTu: 141915 (v7), 161572 (v8)
GeekBench: 5590 (v4.4), 1339 (v5.1)
GFXBench: 5.9fps (ES 3.1 onscreen)
Display Contrast ratio: 1521:1 (nominal)
Loudspeaker Voice 78dB / Noise 72dB / Ring 81dB
Audio quality Noise -94.0dB / Crosstalk -93.3dB
Battery (old) Endurance rating 108h

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