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Xiaomi Redmi 3 vs Nokia G21

2G Network SIM1: GSM 900 / 1800 / 1900 SIM2: GSM 900 / 1800 / 1900 SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - LATAM  
4G Network LTE band 1(2100), 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 28(700), 38(2600), 40(2300), 41(2500)  
Dimensions 139.3 x 69.6 x 8.5 mm 164.6 x 75.9 x 8.5 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 144 g 190 g  
Display Type IPS LCD capacitive touchscreen, 16M colors, MIUI 7.0 IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch  
Display Size 5.0 inches, 720 x 1280 pixels (~294 ppi pixel density) 6.5 Inches   720 x 1600 Pixels (~269 PPI)  
Multitouch Yes
Memory 16GB built-in 64GB Built-in, 4GB RAM  
Card slot microSDXC (dedicated slot)  
RAM 2GB RAM
GPRS Yes Yes
EDGE Yes
WLAN WLAN (Wi-Fi 802.11 b/g/n Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot  
BlueTooth Bluetooth v4.1 with A2DP v5.0 with A2DP, LE  
USB USB (microUSB v2.0) USB Type-C 2.0, USB On-The-Go  
NFC Yes  
GPS Yes Yes + A-GPS support & Glonass, BDS  
Main Camera 13 MP, f/2.0, phase detection autofocus, LED flash, Geo-tagging, touch focus, face/smile detection, HDR, panorama, Video (1080p@30fps), 5 MP, f/2.2, 1080p@30fps Triple Camera: 50 MP, (wide), PDAF + 2 MP, (macro) + 2 MP, (depth), LED Flash   Phase detection, Geo-tagging, touch focus, face detection, panorama, HDR, Video (1080p@30fps)  
Front Camera 8 MP, (wide), Video (1080p@30fps)  
OS Android OS, v5.1 (Lollipop) Android 11 OS  
Chipset 1.5 GHz Cortex Unisoc T606  
Processor 1.5 GHz Quad-Core Cortex-A53, 1.5 GHz Quad-Core Cortex-A53 1.6 Ghz Octa Core  
GPU GPU: Adreno 405 ARM Mali G57  
Sensors 720 x 1280 pixels (~294 ppi pixel density) Accelerometer, Fingerprint (side mounted), Proximity  
Browser HTML5 HTML5  
Sound FM radio, 3.5mm audio jack, DivX/Xvid/MP4/H.264 player, MP3/WAV/eAAC+/FLAC player, YouTube, Google Talk, Games (built-in + downloadable) 3.5mm Audio Jack, Speaker Phone  
Colors Gold, Dark Gray, Silver, Classic Gold Nordic Blue, Dusk  
Battery 4100 mAh (Li-Po Non removable), 5050 mAh   - Fast charging 18W  
Misc GPS + A-GPS support & GLONASS, BDS, Dual SIM + Micro-SIM/Nano-SIM, dual stand-by), Fast battery charging, Active noise cancellation with dedicated mic, Photo/video editor, Document viewer, Google Search, Maps, Gmail, Document viewer, Speakerphone SMS(threaded view), MMS, Email, Push Mail, IM   Document viewer/editor, Photo/video editor