Global smartphone shipments fell -3% YoY in Q4 2021.We estimate the top 20 families of models accounted for 81% of all smartphones shipped worldwide during the quarter. Samsung and Apple top the charts, but Xiaomi’s Redmi, Mi and PoCo series, OPPO's A, K and Reno series, vivo's Y, IQOO, and S series, Lenovo-Motorola's G and E series, realme's C and Narzo series, as well as Honor Number series are on the list. Our extensive report tracks the world's best-selling, top-20 smartphone families and top-50 models by shipment volumes from Q1 2011 to Q4 2021. 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.