martin-dm/Getty Images You can stop spam calls and robocalls by blocking numbers on Android or using Do Not Disturb on iPhone. To stop spam calls and report telemarketers, you can join the National Do Not Call Registry. To screen and block spam calls, you can also use your phone carrier or download a third-party app. Robocalls just won't go away. Try as you might to ignore the ring of telemarketers, the spam always seems to return, no matter what you do. While the Federal Communications Commission has beefed up its own policies around spam and robocalls, it's still mostly on you to stop these annoyances.