It’s been a good five years since Apple came out with the iOS 7 operating system that allowed millions of iPhone owners to block annoying callers (and worse offenders) for the first time. Since then, the art of blocking hasn’t changed much, but there are a few new and improved tweaks available on iOS 11 to help weed out users’ unwanted incoming calls and messages. And if the iPhone's built-in tools aren't enough, there are some apps you can employ to do the blocking too.