Southwestern Bell Telemarketing Call Screener No need to answer the phone to activate. Eliminates both computer and personal telemarketing calls. Nationally recognized legal "do not call" message removes your name from all telemarketing lists and the list of their client's. Active Mode gives you the power to have your calls prescreened. Passive Mode gives you the ability to answer the phone like normal and still activate the screener on any phone call by pressing the '*' key.