Nokia Lumia 638 official Pictures. Nokia Lumia 638 is a Smartphone of nokia. The Nokia Lumia 638 Windows Mobile Smartphone. Announced Dec 2014. Features 4.5″ Display, Snapdragon 400 Chipset, 5 MP Primary Camera, 1830 MAh Battery, 8 GB Storage, 1000 MB RAM, Corning Gorilla Glass 3. Nokia Lumia 638 price starts.