As the iPhone 7 looms, there seems to be a real fear that the global smartphone market has reached its peak when it comes to innovation and opportunities to sell.Sure, every new generation is faster than the previous one, has more memory and a camera with more megapixels, but in the grander scheme of things, all that's rather 'meh'.That doesn't mean that consumers don't want to buy a phone, it's just that often they haven't found one that is different enough for them to fork out their hard-earned cash.Which is where rugged smartphones such as the BlackView BV6000, the Cat S60 and the Dewalt MD501, which we are testing today, can capture a small but not-so-insignificant audience (the above and below images show these three handsets next to each other).