Android Security
Google has released the September 2019 Android Security Bulletin, giving carriers and device makers a fresh set of patches to install. Google device firmware images have also been released to the Google Developer site. Though Google puts out the Android security patches each month, the job of actually getting the fixes to end users falls on the telcos and/or device manufacturers themselves. Those partners vary in their ability to release the patches in a timely fashion.
Google has started pushing the Android 10 stable update to its Pixel smartphone. In addition, the Essential Phone and Redmi K20 Pro are the other non-Google devices receiving the Android 10 update.
iOS 12
Apple has released iOS 12.4.1 to the public, fixing a vulnerability that was reported last week that made it possible to jailbreak many recent iPhone models running iOS 12.4. The release comes after it was discovered that Apple accidentally unpatched a vulnerability that was originally fixed in iOS 12.3.