Smartphone shipments in the United States improved 2% annually in Q1 2018. Apple was number one in hardware, while Android captured top spot in software. AT&T led in terms of shipment volumes, followed by T-Mobile. 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 Q1 2018. Operators covered include Verizon Wireless, AT&T, Sprint and T Mobile.