Apple fixed a security flaw in iOS 9 that was recently identified. Keeping in mind that an attacker with physical access to device could access users’ photos and contacts from the lock screen because Siri was enabled on the lock screen by default.
iOS 9 was downloaded by half of the Apple’s customers in first weekend after its release, a lot of people were exposed to this security flaw. Good thing is Apple moved quite quickly to fix the problem by releasing iOS 9.0.2. Now users don’t need to disable Siri.
This recent update also fixed some other issue such as iMessage activation problem, iCloud backup issues, and bug in mobile data usage.