Smartphone shipments in the United States were down -22% annually in Q2 2018, as the market matured and upgrades replacement rates for smartphones slowed. Apple was number one in hardware, while Android captured top spot in software. T Mobile delivered a great performance. Its uncarrier strategy is proving highly successful. This report tracks smartphone shipments, vendor marketshare, and OS marketshare for the major brands and OS platforms in the United States across 4 top operators and the total market on a quarterly basis from Q1 2011 to Q2 2018. Operators covered include Verizon Wireless, AT&T, Sprint and T Mobile.