Prestigio MultiPhone 8400 Duo official Pictures. Prestigio MultiPhone 8400 Duo is a Smartphone of prestigio. The Prestigio MultiPhone 8400 Duo Windows Mobile Smartphone. Announced Jul 2014. Features 4.0″ Display, Snapdragon 200 Chipset, 8 MP Primary Camera, 2000 MAh Battery, 4 GB Storage, 512 MB RAM. Prestigio MultiPhone 8400 Duo price starts.