Callblock: Adblock for Unwanted Calls is a mobile app for Apple’s iOS that lets users block calls from specific numbers. With the world’s largest directory of telemarketers, Callblock: Adblock for Unwanted Calls can filter out over 3 million numbers from over 100 countries. For those who receive calls from marketing scams, Callblock can take back your phone and reduce pesky annoyances—not only can these unwanted calls be dangerous, they can also be a nuisance. By enabling Callblock, users can also add in specific numbers to the directory so they’ll never be bothered again.