It happens every day. Maybe several times a day. The phone rings, you answer, and a recorded voice tries to sell you a vacation in the Caribbean or a fast track out of debt. Sometimes you answer and no one responds. Either way, you get angry. These marketing calls used to be made by human beings who could make dozens of calls a day. Now they are made by computers with recorded messages, and they are capable of making millions of calls a day. Cheaply. They are robocalls. They are annoying. They waste time and tie up phone lines. In most cases, they are illegal.