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Samsung Galaxy S6 vs Oppo A18 128GB

2G Network GSM 850 / 900 / 1800 / 1900 SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 2100  
4G Network LTE LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 143.4 x 70.5 x 6.8 mm 163.7 x 75 x 8.2 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 138 g 188 g  
Display Type Super AMOLED capacitive touchscreen, 16M colors, TouchWiz UI IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 720 nits (peak)  
Display Size 1440 x 2560 pixels, 5.1 inches (~70.7% screen to body ratio) (~554 ppi pixel density) 6.56 Inches   720 x 1612 Pixels (~269 PPI)  
Multitouch Yes
Protection Corning Gorilla Glass 4 Corning Gorilla Glass  
Memory 32/64/128GB built-in 128GB Built-in, 4GB RAM (+4GB virtual RAM)  
Card slot microSDXC  
RAM 3GB RAM
GPRS Yes
WLAN WLAN (Wi-Fi 802.11 a/b/g/n/ac Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth Bluetooth v4.0 with A2DP v5.3 with A2DP, LE, aptX  
USB USB (microUSB v2.0 (MHL 3 TV-out), USB Host) USB Type-C 2.0, OTG  
NFC No  
GPS Yes Yes + A-GPS support & Glonass, BDS, GALILEO  
Main Camera 16 MP, 3456 x 4608 pixels, optical image stabilization, autofocus, LED flash, Geo-tagging, touch focus, face detection, Auto HDR, panorama, Video (2160p@30fps, 1080p@60fps, 720p@120fps, HDR, dual-video rec), Dual Camera: 8 MP, f/2.0, (wide), AF + 2 MP, f/2.4, (depth, LED Flash   Geo-tagging, touch focus, face detection, panorama, HDR, Video (1080p@30fps)  
Front Camera 5 MP, 1080p@30fps, dual video call, Auto HDR 5 MP, f/2.2, (wide), Panorama, Video (1080p@30fps)  
OS Android OS, v5.0 (Lollipop) Android 13 OS  
Chipset Exynos 7420 Mediatek MT6769 Helio G85 (12nm)  
Processor 1.5 Quad-Core GHz Cortex-A53, 2.1 GHz Quad-Core Cortex-A57 Octa-core (2 x 2.0 GHz Cortex-A75 + 6 x 1.8 GHz Cortex-A55)  
GPU GPU: Mali-T760 Arm Mali-G52  
Sensors Accelerometer, gyro, proximity, compass, barometer, gesture, heart rate Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML5 HTML5  
Sound 3.5mm audio jack, MP4/DivX/XviD/WMV/H.264/H.263 player, MP3/WAV/eAAC+/FLAC player, YouTube, Google Talk, ANT+ support, Games (built-in + downloadable) 3.5mm Audio Jack, MP3/WAV/WMA/eAAC+/FLAC player, MP4/WMV/H.265 player, Speaker  Phone  
Colors White Pearl, Black Sapphire, Gold Platinum, Blue Topaz Glowing Black, Glowing Blue  
Battery 2550 mAh (Li-Po Non removable), 5000 mAh  
Misc GPS + A-GPS support & GLONASS, Wireless charging (Qi/PMA/WPC) - market dependent, Google Search, Maps, Gmail, S-Voice natural language commands and dictation, Nano-Sim, Smart stay, Smart pause, Smart scroll, Air gestures, OneDrive (115 GB cloud storage), Active noise cancellation with dedicated mic, Photo/video editor, Document viewer, YouTube, Calendar, Samsung Pay (Visa, MasterCard certified), FFingerprint sensor (PayPal certified), Speakerphone SMS(threaded view), MMS, Email, Push Mail, IM   IP54, dust and splash resistant, Photo/video editor, Document viewer