There were 3.4 billion robocalls in April this year, and the chances are it feels like you got roughly half of those to your own phone. These calls aren’t just telemarketing anymore, either. Just like email spam, scams pervade these already-annoying automated calls. One way around this is to unplug your landline phone, and to ignore all phone calls to your iPhone (go to Settings > Notifications > Phone and switch off Allow Notifications).
A better way is to troll the robocallers by hooking them up to a service that answers the calls for you, and uses robots to keep the telemarketers on the line, wasting their time an costing them money. And for that, you need the Jolly Roger.