Mobile Apple iOS version market share in the U.S. 2018-2023, by version
As of September 2023, the Apple iOS 16 operating system version had a share of nearly 90 percent amongst all mobile Apple devices in the United States, with the iOS 155 version occupying only 6.85 percent of the Apple mobile market. This graph indicates that most iPhone users in the United States usually update their firmware version within one or two months of the release of a major iOS version.