The update, along with iPadOS 26.2.1 and watchOS 26.2.1 also adds support for the new AirTags.
In summary:
Apple released iOS 26.2.1 to enable full functionality for the new 2nd generation AirTags, including enhanced Precision Finding capabilities.
Macworld reports that users must install this update to access advanced features like Precision Finding on Apple Watch Series 9, Ultra 2, or later models.
The update includes general bug fixes and extends AirTag support across iOS, watchOS, and iPadOS platforms for seamless tracking experiences.