Apple claims to have two billion devices, and these figures are credible. The numbers refer to devices rather than users, and a device is classified as active if it communicates with the Play Store at least once every 30 days. Android devices include smartphones, wearables, tablets, media streamers, and Chromebooks, contributing to over three billion devices in total. A single user can own multiple devices, which can inflate the overall count. Estimates suggest that three billion devices may be used by only 375 million distinct individuals, but there is no verifiable data on the actual number of users versus devices.