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The document summarizes mobile device trends from Sevenval's monthly web traffic analysis for September 2015. It shows that the top 10 mobile devices are all Samsung phones, led by the Galaxy SII. It also shows that the top operating systems are Android and iOS, and that over 6,000 different devices access mobile websites globally each month, with the top 5 devices making up 38.9% of traffic but the long tail of other devices accounting for 61.1% of traffic. It concludes that for responsive web design, one must consider all possible combinations of unique client devices, browsers, and operating systems, of which there are over 100,000 in the current market.