Garmin-Asus Nuvifone M20 official Pictures. Garmin-Asus Nuvifone M20 is a Smartphone of garmin-asus. The Garmin-Asus Nuvifone M20 Windows Mobile Smartphone. Announced Feb 2009. Features 2.8″ Display, MSM7200A Chipset, 3.15 MP Primary Camera, 920 MAh Battery, 8 GB Storage. Garmin-Asus Nuvifone M20 price starts.