Handset shipments in the United States were down dramatically YtY in Q1 2019. Apple held the top spot across all major carriers, followed by Samsung, LG and Motorola. T-Mobile was the standout operator, followed by AT&T. This extensive report tracks mobile handset shipments and vendor marketshare for major vendors at the "big 4" operators in the United States on a quarterly basis from Q1 2009 to Q1 2019.