Strategy Analytics tracked global smartphone shipments (sell in) grew +45% YoY in April 2021 because of the sharp fall last year from the outbreak of COVID-19. Sales volume also improved +55% YoY. However, both shipment and sales registered a sequential decline from March 2021. Samsung maintained the top position, followed by Xiaomi, Apple, OPPO and Vivo etc. This report tracks global smartphone monthly shipments (sell in), sales (sell through) and inventory volumes / ratio by 32 of the world's largest vendors from January 2016 to April 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.