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Microsoft Lumia 640 Dual SIM vs Oppo Reno 15

2G Network SIM1: GSM 850 / 900 / 1800 / 1900 SIM2: GSM 850 / 900 / 1800 / 1900 SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 1900 / 2100 HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100  
4G Network LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 20(800), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
5G Network SA/NSA  
Dimensions 141.3 x 72.2 x 8.8 mm 158 x 74.8 x 7.77mm (Twilight Blue), 7.89mm (Aurora White)  
Sim Type Nano-SIM + Nano-SIM + eSIM (max 2 at a time)  
Weight 145 g 197 g  
Display Type IPS LCD capacitive touchscreen, 16M colors, ClearBlack display AMOLED Capacitive Touchscreen, 1B Colors   120Hz, HDR10+, 600 nits (typ), 1200 nits (HBM)  
Display Size 5.0 inches (~67.6% screen to body ratio), 720 x 1280 pixels (~294 ppi pixel density) 6.59 Inches   1256 x 2760 Pixels (~460 PPI)  
Multitouch Yes
Protection Corning Gorilla Glass 3 Corning Gorilla Glass 7i  
Memory 8GB built-in 256GB Built-in, 12GB RAM, UFS 3.1  
Card slot microSD card (supports up to 128GB) No  
RAM 1GB RAM
GPRS Yes
WLAN WLAN (Wi-Fi 802.11 b/g/n Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth Bluetooth v4.0 with A2DP v5.4 with A2DP, LE, aptX HD, LHDC 5  
USB USB (microUSB v2.0) USB Type-C 2.0, OTG  
NFC Yes  
GPS Yes Yes + GPS, GLONASS, GALILEO, BDS, QZSS  
Main Camera 8 MP, 3264 x 2448 pixels, autofocus, LED flash, 1/4'' sensor size, Video (1080p@30fps), Triple Camera: 50 MP, f/1.8, 26mm (wide), PDAF, OIS + 50 MP, f/2.8, 80mm (telephoto), PDAF, OIS, 3.5x optical zoom + 8 MP, f/2.2, 15mm, (ultrawide), 1/4.0", AF, LED Flash   Color spectrum sensor, HDR, panorama, Video (4K@30/60fps, 1080p@30/60/120fps, gyro-EIS, HDR)  
Front Camera 1 MP, 720p 50 MP, f/2.0, 18mm (ultrawide), AF, Panorama, HDR, Video (4K@30/60fps, 1080p@30/60fps, gyro-EIS, HDR)  
OS Microsoft Windows Phone 8.1 with Lumia Denim Android 16 OS  
Chipset Qualcomm Snapd Qualcomm SM7750-AB Snapdragon 7 Gen 4 (4 nm)  
Processor 1.2 GHz Quad-Core Cortex-A7 Octa-core (1 x 2.8 GHz Cortex-720 + 4 x 2.4 GHz Cortex-720 + 3 x 1.8 GHz Cortex-520)  
GPU GPU: Adreno 305 Adreno 722  
Sensors Accelerometer, proximity, compass Accelerometer, Compass, Fingerprint (under display, optical), Gyro, Proximity, BeaconLink calls via bluetooth, up to 200m  
Browser HTML5 HTML5  
Sound Stereo FM radio with RDS, 3.5mm audio jack, MP4/H.264/H.263/WMV player, MP3/WAV/eAAC+/WMA player, Video/photo editor, Games (built-in) Speaker Phone  
Colors Glossy cyan, Orange, White, Matte black Twilight Blue, Aurora White  
Battery 30 min 2500 mAh 6500 mAh   - Fast battery 80W wired, 80W UFCS, 55W PPS, 13.5W PD, 13.5W QC, 100% in 50 min, Reverse wired  
StandBy Time Stand-by up to 840 hrs
TalkTime Talk-time up to 27 hrs
Misc GPS + A-GPS support, GPU, Dual SIM (Micro-SIM, dual stand-by), Active noise cancellation with dedicated mic, Document viewer/editor, Speakerphone SMS(threaded view), MMS, Email, Push Mail, IM   NFC (market/region dependent), Glass front + Gorilla Glass 7i), aluminum frame, glass back, IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min)