A soaked phone or tablet has traditionally meant shelling out for a costly replacement. But new technology has moved beyond waterproof cases and "rugged" cell phones designed to withstand rough conditions. Devices highlighted at this year's Mobile World Congress and Consumer Electronics Show suggest the future is bright for phones and tablets that are both stylish and waterproof -- or at least water-resistant. The level of waterproofing is already incorporated in a few Sony smartphones such as the Acro S and Advance, and most recently with the Xperia Z.