I have been having the same problem with daily text msgs from this company. I don't even use text messaging! Calling my cell phone company and then going through the steps to block messages from this number did not help either. I also started getting these msgs after calling 1-800-Free 411. I will try text messaging "stop". It sounds like that has worked for others.
I also started receiving these irritating texts immediately after dialing 1-800-free-411. Free my [***]. I went to the website 'Frengo', Buzz, etc. I also sent "Stop" in reply that sent back another message stating I was unsubscribed. Sheesh.
The worst part is that Free 411's voice recognition is so bad, I couldn't even get a phone number out of it. It kept asking if I was looking for farmers markets when I said Gamestop.
I also started getting these text from 44566 after calling 1-800-free-411. Believe me, I would rather pay the charge than have these people texting me all hours of the night. I followed the advice of others in this thread and replied STOP and the text stopped.