Global smartphone shipments declined -4% annually in Q1 2019. We estimate the top 20 families of models accounted for 8 in 10 of all smartphones shipped worldwide during the quarter. Apple and Samsung top the charts, but Xiaomi’s Redmi series, Huawei's Honor, Ascend, Nova and Enjoy series, vivo's Y, X and V series, OPPO's R, A and F series, Xiaomi's Mi series, Lenovo-Motorola's G and E series are quietly gaining traction. Our extensive report tracks the world's best-selling, top-20 smartphone families and top-50 models by shipment volumes from Q1 2011 to Q1 2019. The report is a valuable tool for component makers, car manufacturers, content suppliers, mobile operators, device vendors and other stakeholders who want to identify and measure the world's most-popular smartphones by individual families and model.