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.