How Can Direct Marketing Calls Get Blocked?

Direct marketing can use phone numbers bought from a data broker for sales calls, leading people with no prior contact to block the number.
When many recipients block or report the caller, phone networks may label future calls as spam, reducing the number of people who answer.
A purchased contact list may contain names and phone numbers without showing whether each person agreed to receive sales calls.
The sales team loads those numbers into its calling system and contacts people who never asked about the product.
The recipient receives a sales pitch from a company they do not know.
The recipient may end the call and block the number to prevent further contact.
Most mobile phones also allow blocked callers to be reported as spam.
Phone networks and caller-identification services compare reports submitted by different users.
If the same number is reported repeatedly, later calls may show a spam warning and go unanswered.