Sonim XP3340 Sentinel official Pictures. Sonim XP3340 Sentinel is a Smartphone of sonim. The Sonim XP3340 Sentinel Smartphone. Announced Aug 2011. Features 2.0″ Display, 2 MP Primary Camera, 1750 MAh Battery, MIL-STD-810G Compliant, Corning Gorilla Glass. Sonim XP3340 Sentinel price starts.