Sonim XP8 XP8800 64GB Black For AT&T ONLY Rugged Cell Phone Smartphone. With certifications such as IP68, IP69, and MIL-STD-810G this AT&T military smartphone is truly rugged. This cellular device operates with an Octa-Core 2.2GHz processor, 4GB of RAM, and Android OS version 7.0 (Nougat).