Smartphones – once plasticky slabs without much in terms of visual appeal – have evolved quite a bit over the years. They wow us with their near-bezelless construction and they sparkle with their glass-on-metal designs. Beauty, comes at a cost, however. Modern smartphones aren't really known for being durable, which is probably why making smartphone cases is a billion-dollar industry.But the smartphones we've listed below are quite different. These extra-tough handsets won't wow you with their crude looks, but they'll probably outlive any of today's shiny-yet-fragile flagship ...