I block a number and the next time they call switching around the digits nothing works to stop them. I am on the Do Not Call list and it doesn't matter. Annoying. We don't answer numbers we don't recognize. We are on the do not call list. Doesn't seem to make any difference anymore.,Calls daily hang up before answering machine turns on .annoying wish they would stop calling or at least have the courtesy, to leave a message this particular only rang once before being disconnected