FYI- for those of you who registered with
donotcall.gov when it was first created (about five years ago), you will need to re-register your number because it keeps you on the list for only five years. You can also register cell phones, and though I've not heard any cases about text messaging ads to a registered cell number, I would bet that the law also covers text messages sent to numbers registered with donotcall.gov.
Remember that it takes about 31 days for the registration to take effect.
In the past, I've filed two complaints against companies who were brave enough to leave ad messages on my answering machine when I was registered. I had hoped for more follow-up info from the govt when I reported them, but never received any follow-up, though the companies never called again. If charged, the penalty is something like $11,000 per call, which is enough to gain their attention.