The mobile operating system offers a bunch of new functions to predict users' needs for music, notifications and more. Apple also unveils updates to its Maps and Notes apps, and News, a news-reading app.
The latest data shows growing adoption for Apple's current mobile OS as iOS 9 is expected to be unveiled in June.
Letting more people test software before its final release helps Apple find bugs faster -- and potentially nip bigger problems in the bud, too.
The company's online stores were down for about 12 hours Wednesday because of an internal server error.
Update to Apple's mobile OS will add and enhance certain health features as the company gets ready to share more about its Apple Watch on Monday, according to a report.
The rate of adoption picked up steam with the release of iOS 8.1.3, which fixed some bugs and eased the software's demand for storage space on devices.
The latest update to iOS 8 reduces the amount of space needed to install an update and squashes a number of bugs.
The number of people jumping to the latest version of Apple's mobile OS has slowed down dramatically, according to Apple's latest stats.
Apple's latest version of its mobile OS has picked up a bit more steam following the holidays.
The newest version of Apple's mobile OS didn't get off to as fast a start as its predecessor, but it's picking up steam.