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Nokia Lumia 638
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Launch
Announced
2014, December
Status
Available. Released 2014, December
Network
Technology
GSM / HSPA / LTE
2G
GSM 850 / 900 / 1800 / 1900
3G
HSDPA 850 / 900 / 1900 / 2100 - RM-1010
4G
LTE band 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500)
Speed
HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
GPRS
Yes
Edge
Yes
Body
Dimensions
129.5 x 66.7 x 9.2 mm (5.10 x 2.63 x 0.36 in)
Weight
136 g (4.80 oz)
SIM
Micro-SIM
Display
Type
IPS LCD capacitive touchscreen, 16M colors
Size
4.5 inches (~64.6% screen-to-body ratio)
Resolution
480 x 854 pixels (~218 ppi pixel density)
Multitouch
Yes
Protection
Corning Gorilla Glass 3
Platform
OS
Microsoft Windows Phone 8.1
Chipset
Qualcomm Snapdragon 400
CPU
Quad-core 1.2 GHz Cortex-A7
GPU
Adreno 305
Memory
Card Slot
microSD, up to 256 GB (dedicated slot)
Internal
8 GB, 1 GB RAM
Camera
Primary
5 MP, autofocus
Features
1/4" sensor size, geo-tagging, panorama
Video
Yes
Secondary
No
Sound
Alert types
Vibration; MP3, WAV ringtones
Loudspeaker
Yes
3.5mm Jack
Yes
Comms
WLAN
Wi-Fi 802.11 b/g/n, DLNA, hotspot
Bluetooth
v4.0, A2DP, LE/ aptX after WP8 Denim update
GPS
Yes, with A-GPS, GLONASS
Radio
FM radio
USB
microUSB v2.0
Features
Sensors
Accelerometer
Messaging
SMS (threaded view), MMS, Email, Push Email, IM
Browser
HTML5
Java
No
Battery
Battery
Removable Li-Ion 1830 mAh battery (BL-5H)
Misc
Colors
Black
SAR EU
1.46 W/kg (head)     0.95 W/kg (body)    
Price group
2/10 (About 100 EUR)