I used to work for market research companies as an interviewer, market research survey calls are not included in the law by the National DNC list, so you may receive calls from market research, they also do not have time restrictions like solicitors since they are not selling anything, companies like Gallup however try to keep it no later than 9 PM. Most research companies also can disposition a call as Do Not Call, and have the number on a list, but not all of them do this, they are also not required to do so, Gallup and MSR out of Omaha however do, Its annoying, they still cannot call a personal cell phone though unless you give them permission. If they tell you they can not put you on a DNC list...ask for a supervisor or manager...they'll normally get you on something or remove the number from the current program database. I hope this helps.