Global smartphone sales volume will grow +5% YoY in 2021 driven by the eased pandemic and improved economy outlook, 5G migration and new hardware innovations etc. However, as the pandemic development varies among countries and regions, we expect the recovery path would be bumpy and varies from country to country this year. Android (including Fuchsia OS) will maintain its leadership in global smartphone market followed by iOS by 2026. Huawei's Harmony OS in contrast remains uncertain and risky in smartphone market. Our extensive report forecasts global smartphone sales, by 15 operating systems, for 88 countries worldwide, from 2007 to 2026. Almost every major country worldwide is covered, including United States, China, India, Indonesia, Japan, South Korea, Russia, Brazil, Mexico, South Africa, Saudi Arabia, UK, Germany, France, Italy and Spain. This report can be used by operators, software developers, content developers, handset vendors, component makers, car manufacturers and other stakeholders to determine the size and growth rate of the huge global smartphone OS market.