Number Finder -Unknown Numbers is a mobile app developed for Apple’s iOS platform that allows users to search and find unknown numbers. Even for those who have caller ID, unknown numbers can be a hassle when trying to go about your day. The usual solution is to let the phone ring, but with Number Finder -Unknown Numbers, you can dig deep and find out exactly who’s calling without picking up the phone and risking getting sucked in by telemarketers and spam calls. With a database of over 300 million numbers, Number Finder -Unknown Numbers gives you information about each one.