Apple's iPhone and RIM's BlackBerry line are effectively strangling the market for mid-range phones, analysts at Deutsche Bank found in a new report. The companies now represent two thirds of all phone revenue but combined only make up about 10 percent of the market, leaving very little room for anything but very low-end, high-volume devices. Korean companies are suffering the most as their focus on feature-laden but "dumb" phones that are no longer selling as well.