For anyone who has old Samsung smartphone, you should be aware of newly discovered vulnerability which affects all Samsung smartphones released since 2014. This is a remote vulnerability so you do not need to download anything in order for your phone to become compromised, it can spread through SMS messaging.
9to5google.com
It has been already patched on new phones such as Galaxy S10 and S20 but if you have old phone - most likely it will not be patched or patched at later time. Samsung does not like to support old phones in terms of security, they have already moved Galaxy S8 phones to a quarterly update schedule from a monthly security update schedule. This does not affect any other Android phone by any other manufacturer.

Samsung security vulnerability exposed on Android phones - 9to5Google
A security vulnerability on Samsung's Android phones sold since 2014 left the door open for attackers, but it's in the process of being patched.

It has been already patched on new phones such as Galaxy S10 and S20 but if you have old phone - most likely it will not be patched or patched at later time. Samsung does not like to support old phones in terms of security, they have already moved Galaxy S8 phones to a quarterly update schedule from a monthly security update schedule. This does not affect any other Android phone by any other manufacturer.