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Nokia Lumia 635 vs Xiaomi Redmi A1 Plus

2G Network GSM: 850 / 900 / 1800 / 1900 SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 1900 / 2100  
4G Network LTE 800 / 1800 / 2600 LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 129.5 x 66.7 x 9.2 mm 164.9 x 76.75 x 9.09mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 134 g 192 g  
Display Type 16M colors, IPS LCD capacitive touchscreen, ClearBlack display IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   400 nits (typ)  
Display Size 480 x 854 pixels, 4.5 inches (~218 ppi pixel density) 6.53 Inches   720 x 1600 Pixels (~269 PPI)  
Multitouch Yes
Protection Corning Gorilla Glass 3
Memory 8GB built-in 32GB Built-in, 2GB RAM  
Card slot microSD card (supports up to 128GB) microSDXC (dedicated)  
RAM 512MB RAM
GPRS Yes Yes
EDGE Yes
WLAN WLAN (Wi-Fi 802.11 b/g/n Wi-Fi 802.11 a/b/g/n, hotspot  
BlueTooth Bluetooth v4.0 with A2DP v5.0 with A2DP, LE  
USB USB (microUSB v2.0) microUSB 2.0  
NFC No  
GPS Yes Yes + A-GPS support & Glonass, BDS  
Main Camera 5 MP, 2592 x 1936 pixels, autofocus, 1/4'' sensor size, Geo-tagging, panorama, Video (720p@30fps) Dual Camera: 8 MP, (wide) + 0.3 MP, Dual LED Flash   Phase detection, geo-tagging, touch focus, face detection, Video (1080p@30fps)  
Front Camera 5 MP, HDR, Video (1080p@30fps)  
OS Microsoft Windows Phone 8.1 Android 12 Go edition  
Chipset GPU: Adreno 30 Mediatek MT6761 Helio A22 (12 nm)  
Processor 1.2 GHz Quad-core Cortex-A7, Qualcomm Snapdragon 400 2.0 Ghz Quad Core Cortex-A53  
GPU GPU: Adreno 305 PowerVR GE6300  
Sensors Accelerometer, proximity Accelerometer, Fingerprint (rear-mounted)  
Browser HTML5 HTML5  
Sound FM radio, 3.5mm audio jack, MP4/H.264/H.263/WMV player, MP3/WAV/eAAC+/WMA player, Video/photo editor, SNS integration, Games (built-in) 3.5mm Audio Jack, 24-bit/192kHz audio, Speaker Phone  
Colors Bright Orange, bright green, bright yellow, white, black Light Green, Light Blue, Black  
Battery Talk time up to 12hrs Stand-by up to 684hrs Music play up to 58hrs 1830 mAh (Li-ion Non removable), 5000 mAh   - Battery charging 10W  
StandBy Time Talk time up to 12hrs Stand-by up to 684hrs Music play up to 58hrs 1830 mAh
Misc GPS + A-GPS support and GLONASS, Dual sim, 7GB free SkyDrive storage, Document viewer/editor, Predictive text input, Active noise cancellation with dedicated mic, Speakerphone SMS(threaded view), MMS, Email, Push Mail, IM   Photo/video editor, Document viewer