The Australian Signals Directorate s Australian Cyber Security Centre (ACSC) has published a set of two guides designed to help Australian government, commercial organizations, and enterprises harden the security of iOS and Android devices. The ACSC recommendations apply to Samsung Galaxy S9 and S9+ running Android 8.0 or higher and Apple iOS 12 devices while being used within Australia, and are based on in-house technical testing, as well as on experiences shared by other organizations and on consultation received from vendors.
Source: https://www.bleepingcomputer.com/news/security/australian-govt-issues-android-and-ios-security-hardening-guides/