Smartphone shipments in the United States were flat annually in Q2 2017, as the market matured and upgrades replacement rates for smartphones slowed. Samsung was number one in hardware, while Android captured top spot in software. T Mobile delivered a great performance, as its smartphone volumes soared to the highest level ever for a Q2 quarter. Its uncarrier strategy is proving highly successful. This report tracks smartphone shipments, vendor marketshare, and OS marketshare for 20 major brands and 4 major platforms in the United States across 4 top operators and the total market on a quarterly basis from Q1 2011 to Q2 2017. Operators covered include Verizon Wireless, AT&T, Sprint and T Mobile.