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Nokia Lumia 638
OS Microsoft Windows Phone 8.1 with Lumia Cyan, upgradable to Windows 10 Mobile, Live Tiles, Cortana Voice Assistant, Action Center, SensorCore Motion Tracking, Microsoft Office Mobile, OneDrive & Zero Bloatware
Chipset Qualcomm Snapdragon 400 MSM8926 (28 nm 1.2GHz Quad-Core 32-bit Cortex-A7 Processor with Adreno 305 GPU @ 450MHz) + Dedicated SensorCore Low-Power Motion Sensing DSP Coprocessor
RAM 1GB RAM (Upgraded Full 1GB RAM for seamless app compatibility & Windows 10 Mobile upgrade!)
Storage 8GB
Display 4.5 inches • 480 x 854 pixels (16:9, Compact 4.5" FWVGA 480p 16:9 ClearBlack IPS LCD Display with TrueColor, 218 ppi)
Main camera Pro 5.0 MP Rear Camera with 1/4" Sensor, Autofocus, 28mm Wide Lens, Lumia Camera App & 720p Video: 5.0 MP f/2.4 28mm (autofocus in 0.1s!, Lumia Camera pro manual controls, Lumia Cinemagraph, Panorama, 720p@30fps HD video recording)
Selfie camera None
Battery Monumental 1830 mAh Colossal Monster Battery! (Removable Li-Ion BL-5H, swappable on the go! Powers over 14 hours continuous calling / 480 hours (over 20 DAYS!) standby / 7.5 hours continuous video / 60 hours audio!), Micro-USB 2.0 charging in box + Battery Saver • Removable Li-Ion 1830 mAh BL-5H (swappable on the go!)
Weight 134 g (4.73 oz)

Latest Nokia Lumia 638 user agents:

User Agent Browser Platform
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/8.0; Touch; rv:11.0; WebBrowser/8.1; IEMobile/11.0; NOKIA; Lumia 638) like Gecko UCBrowser/4.2.1.541 Mobile UC Browser 4 Windows Phone 8Lumia 638
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/8.0; Touch; rv:11.0; WebBrowser/8.1; IEMobile/11.0; NOKIA; Lumia 638) like Gecko IE Mobile 11 Windows Phone 8Lumia 638
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; rv:11.0; WebBrowser/8.1; IEMobile/11.0; NOKIA; Lumia 638) like Gecko UCBrowser/4.2.1.541 Mobile UC Browser 4 Windows Phone 8Lumia 638
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; rv:11.0; WebBrowser/8.1; IEMobile/11.0; NOKIA; Lumia 638) like Gecko IE Mobile 11 Windows Phone 8Lumia 638
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 638) like Gecko IE Mobile 11 Windows Phone 8Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 6.0.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Mobile Safari/537.36 Edge/15.15063 Microsoft Edge 15 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 6.0.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Mobile Safari/537.36 Edge/15.14965 Microsoft Edge 15 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 6.0.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Mobile Safari/537.36 Edge/14.14393 Microsoft Edge 14 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.82 Mobile Safari/537.36 Edge/14.14332 Microsoft Edge 14 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Mobile Safari/537.36 Edge/14.14295 Microsoft Edge 14 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Mobile Safari/537.36 Edge/13.10586 Microsoft Edge 13 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Mobile Safari/537.36 Edge/13.10581 Microsoft Edge 13 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Mobile Safari/537.36 Edge/12.10166 Microsoft Edge 12 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; NOKIA; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Mobile Safari/537.36 Edge/12.0 Microsoft Edge 12 Windows Phone 10Lumia 638
Mozilla/5.0 (Windows NT 6.2; ARM; Trident/7.0; Touch; rv:11.0; WPDesktop; NOKIA; Lumia 638) like Gecko Internet Explorer 11 Windows RTLumia 638
Mozilla/5.0 (Windows NT 10.0; ARM; Lumia 638) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393 Microsoft Edge 14 Windows 10Lumia 638
Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 638) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537 IE Mobile 11 Windows Phone 8Lumia 638
Mozilla/5.0 (compatible; MSIE 10.0; Windows Phone 8.0; Trident/6.0; IEMobile/10.0; ARM; Touch; NOKIA; Lumia 638) IE Mobile 10 Windows Phone 8Lumia 638