We've seen our fair share of rugged smartphones, but there's a certain amount of attention due when a heavy equipment builder like Caterpillar gets involved. Its newest smartphone, the CAT B15, undoubtedly has the survivability you'd expect from a company that makes bulldozers: the aluminum-and-rubber shell can survive 5.9-foot drops on to hard concrete, stay immersed in 3.3 feet of water for half an hour and keep working in temperatures between -4F to 122F. Just don't expect top-flight performance elsewhere. While we're big fans of the CAT B15 shipping with
