AT&T Unleashes the Motorola ES400, a Durable Device Built for Business by Kristofer Brozio • October 5, 2010 So, apparently AT&T has their own rugged phone being released from Motorola called the ES400 and I like it better than the Ravine from Verizon that’s sure. The Motorola ES400 is designed to withstand dust, shock, vibration, rain, humidity, solar… Read…