I was surprised to learn today that we do not have the ability to block a number that is using SMS to text me SPAM. All numbers that are blocked from voice should also be Blocked from sending text messages. Is omeone is only using SMS those #s should be blckable as well.
You can block that number and it will stop the spam texts from that number. I have done that in the past and it worked. Just to verify it, before I posted this, I blocked my wife's cell phone and then sent a text to my RC digital line (the one I receive texts on). I did not receive that text, even after waiting over 10 minutes.
I then unblocked her cell phone and sent a second text, with different wording to tell the difference, and it went through immediately. The other text has still to be received, even though it was sent over 15 minutes ago. Yet the second text was received immediately.
Have you tested this yourself? It works for me and I recall this might have been brought up once before and my solution worked for them as well.
If you want to block it from all your digital lines, simply block it in the Super Admin extension.