Apple has squashed a number of lingering bugs in the new iOS 9.0.2 update, released Wednesday, including fixes for iMessage activation problems, issues with iCloud backups, and an ongoing bug with cellular data settings.
Apps, notably Podcasts, have also been improved.
On the security side of things, there was one security fix, according to the iOS 9.0.2 release notes: a flaw in the lock screen that allowed unauthorized access to photos and contacts, without the user's passcode.
The reported "dead simple" lock screen bypass was published last week. Anyone with physical access to the device could gain access through the lock screen if Siri was available.