1. Find a person by a name or phone number worldwide for free using Truecaller.

  2. Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.

  3. Search over 1 Billion phone numbers worldwide. Identify unknown phone numbers and block unwanted calls.

  4. This application both blocks unwanted calls and SMS, and helps manage a blacklist.

  5. Blacklist Blocker is a free Android application for blocking unwanted calls and SMS

  6. Powerful call & spam blocker and reverse lookup tool

  7. Block calls from annoying or private numbers on your Android device. By bitfire.

  8. WhosCall is a reliable caller ID app whose popularity has led to its adoption by many users including international media. You can now manage the numbers calling you regardless of whether they are part of your contact list or not... read more.

  9. Caller ID, phone number tracker, call blocker, contacts location, works offline

  10. "Call Blocker" helps you avoid annoying calls.

  11. Block robocalls and spam using a simple and efficient whitelist

  12. Theuknowncall.com provides information about calls or text messages from unknown phone numbers.