New to the iPhone with the release of iOS 16 is the ability to report SMS/MMS messages as junk. This expands on the built-in "Report Junk" feature in Messages that previously only let you report iMessages. Now you can use the same option to report an SMS/MMS message as junk, which will alert Apple and your network carrier and delete the message in question.
In this podcast, Thomas Domville shows us how it works.
Note that availability of this feature will depend upon your region and carrier. This Apple Support page provides more information.