YES... I.e.: if you are on the national DNC registry, and an automated telemarketer keeps calling you, the best thing to do is have the state att'y general mail them a letter, and eventually this will actually scare them enough to stop calling.
Called me on my cell on 7/14. No called ID info received. Have gotten a car warranty call lately to but unsure if that previous call was same number. No voicemail left.