Strategy Analytics tracked global smartphone shipments (sell in) went down -8% annually in October 2021 due to supply constrain and the mixed demand in multiple markets. Sales volume also declined -7% YoY. Samsung maintained the top position, followed by Apple, Xiaomi, OPPO (including OnePlus) and Vivo etc. This report tracks global smartphone monthly shipments (sell in), sales (sell through) and inventory changes by 32 of the world's largest vendors from January 2016 to October 2021. The report is a valuable tool for OEMs, component makers, software developers, operators and other stakeholders to track key OEMs inventory level and support their planning activities.