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Samsung Galaxy S3 Slim 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 / 2100 HSDPA 850 / 900 / 2100  
4G Network LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 133 x 66 x 9.7 mm 163.7 x 75 x 8.2 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 139 g 188 g  
Display Type TFT capacitive touchscreen, 16M colors, TouchWiz UI IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 720 nits (peak)  
Display Size 540 x 960 pixels, 4.52 inches (~244 ppi pixel density) 6.56 Inches   720 x 1612 Pixels (~269 PPI)  
Multitouch Yes
Protection Corning Gorilla Glass  
Memory 8GB built-in 128GB Built-in, 4GB RAM (+4GB virtual RAM)  
Card slot microSD card (supports up to 32GB) microSDXC  
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 v5.3 with A2DP, LE, aptX  
USB USB (microUSB v2.0) USB Type-C 2.0, OTG  
NFC No  
GPS Yes Yes + A-GPS support & Glonass, BDS, GALILEO  
Main Camera 5MP, 2592 ? 1944 pixels, autofocus, LED flash, geo-tagging, Video, 2ndary VGA 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, f/2.2, (wide), Panorama, Video (1080p@30fps)  
OS Android OS, v4.2 (Jelly Bean) Android 13 OS  
Chipset Mediatek MT6769 Helio G85 (12nm)  
Processor 1.2 GHZ Quad-Core Octa-core (2 x 2.0 GHz Cortex-A75 + 6 x 1.8 GHz Cortex-A55)  
GPU Arm Mali-G52  
Sensors Accelerometer, proximity, compass Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML HTML5  
Sound 3.5mm audio jack, MP4/WMV/H.264/H.263 player, MP3/WAV/eAAC+/Flac player, SNS integration, YouTube, Google Talk, Image/video editor, Games (built-in + downloadable) 3.5mm Audio Jack, MP3/WAV/WMA/eAAC+/FLAC player, MP4/WMV/H.265 player, Speaker  Phone  
Colors Black, White Glowing Black, Glowing Blue  
Battery 2100 mAh (Li-Po Non removable), 5000 mAh  
Misc GPS + A-GPS support & GLONASS, MicroSIM card support only, Document viewer, Google Search, Maps, Gmail, Calendar, Google Talk, Picasa, Predictive text input (Swype), Speakerphone SMS(threaded view), MMS, Email, Push Mail, IM   IP54, dust and splash resistant, Photo/video editor, Document viewer