They call my mother's cell phone all the time at all hours! She's 82, blind and in a wheelchair. She lives with me and my family (so I can take care of her.) Her cell phone number is now on the National Do Not Call Registry, so the next time they call...I'm going to file a complaint!
Truthfully, I don't know how effective the Do Not Call list is, but I know I'll feel better filing a complaint even if the calls don't stop.