You cannot read SMS messages using current Android without Google's permission which you are unlikely to get. Prior to Android 9 it was possible, using content resolver I think.
For whatever reason, Google seems to allow some apps to access the SMS database and do backups/restores even though the app is not the default "SMS Messaging" app.
You cannot read SMS messages using current Android without Google's permission which you are unlikely to get. Prior to Android 9 it was possible, using content resolver I think.