Here's the reply from the Do Not Call Registry.
Thank you for your message. The National Do Not Call Registry is only
for personal phone numbers. The Registry does not cover text messaging.
You may wish to contact the Federal Communications Commission (FCC) at
www.fcc.gov. Information about the FCC's rules regarding the Do Not
Call Registry can be found at
http://www.fcc.gov/cgb/donotcall/ or at
http://www.fcc.gov/cgb/policy/telemarketing.html.
Well, now we know how to get around such things as laws, which is going to really annoy me a lot if I start to get more. My congress critters will be alerted.