This app was mentioned in 2 comments, with an average of 1.00 upvote
https://play.google.com/store/apps/details?id=com.jomegasoft.pingsmsnoad&hl=en
It used to be only the intelligence services could silent ping your SMS. Now there's an app for that. ;-)
A common tracking scheme is to silent ping a phone then use direction tracking hardware to locate it.
SMS can be spoofed. You really have no information assurance.
Thanks to the stupid internet gateways, you can ddos a phone with SMS.
There are cramming scams that can charge money to your phone with SMS services.
Look at all the imessage screw ups Apple has had using SMS as a backbone of the system. Really it has long been time to dump SMS.
Now the carriers like to use it for notifications, so I still allow 3 digit SMS since I think they are secure.