Some highly rated rugged military cell phones are the Verizon G'zOne Boulder, T-Mobile Motorola Defy and Sony Xperia Z3, according to PopularMechanics.com, PCMag.com and CNET.com. Rugged military cell phones are typically designed to withstand dust, water and falls, as they meet Military Specification 810F.
The Verizon G'zOne Boulder is water-resistant and features a clamshell design that is able to withstand falls. The T-Mobile Motorola Defy is waterproof. The phone is made of soft-to-the-touch plastic and has covers over all ports, sides and the battery cover to protect the internal unit from water.
The Sony Xperia Z3 is water-resistant and can be submerged in five feet of water and take underwater photos.