Sonim XP400 official Pictures. Sonim XP400 is a Smartphone of sonim. The Sonim XP400 Android Smartphone. Announced Jan 2025. Features 6.5″ Display, Snapdragon 4 Gen 2 Chipset, 5000 MAh Battery, 128 GB Storage, 6 GB RAM, MIL-STD-810H Compliant, Corning Gorilla Glass Victus 2. Sonim XP400 price starts.