I've never handled an S30, so can't say for sure, but if it had the option it would be in the message app's notification settings. The stock message app is one of the things that it chosen by the manufacturer, so varies between phones. I really doubt that the people who make these choices gave even a second's thought to this feature, and even if they had there would be no way of finding out without getting hold of one and looking at the app - it's a level of detail way below what would be documented. If they were bought for emergency response call-outs the toughness of the phone was probably the primary factor in the choice.
I can understand them discouraging people from installing their own apps on it, but if the pre-installed software doesn't do this I can't think of any other way.