Who - Caller ID, Spam Block

WHO is the world’s best Caller ID, spam-blocking app. Manage all your calls and messages quickly by filtering out telemarketers, robocalls, and other unwanted disturbances. With a community-based spam list updated by millions of users worldwide, WHO is the only app you need to make your communication safe and efficient.

True Caller Identification - Caller ID

• The world’s best Caller ID will identify anyone calling you


• You can identify the calls you receive from numbers that do not exist in your Contacts


• Get alerts instantly if you get an unwanted call to protect yourself from robocalls, telemarketers, and scam calls

The Best Spam Detection & Block - RoboKiller

• Detect Robocalls, Telemarketer, Fraud, and Scam calls


• Community-based spam call reporting in real-time


• Spam call blocker - get notified before you answer if the number is a spammer

People Search & Background Checks

• Find people and look up phone numbers, including mobile numbers and addresses


• All background check searches are confidential and powered by many different sources

Manage Your Phone Contacts

• Add names and addresses from WHO to your phone book contacts to keep them accurate and current


• See your contacts within WHO and lookup whether your contacts have another phone number

Reverse Phone Lookup, Caller ID, Address Search & Email Lookup

• Identify who is calling, including spam calls, in seconds with one-click search


• Use reverse phone lookup to find out who owns a phone number and get their background report

Yellow Pages

• Find businesses around you and get phone numbers, directions, and business hours

With over 10 million unique monthly visitors, WHO empowers users with up-to-date, detailed data about people. WHO's proprietary technology organizes 12 billion records to help users reconnect, update lost contact information, potential business prospects, reunite with family and friends, and protect themselves from fraud or scammers while discovering and monitoring their own online footprint.