Who’s Called is a UK-focused phone number lookup and caller-information service operated by MindSpec Inc. It helps people identify unfamiliar landline and mobile numbers by searching a community database of more than 2.8 million numbers. Users can view reports about suspected spam, scams, telemarketing, silent calls and legitimate businesses, and contribute their own experiences. The lookup is free, anonymous and does not require registration.

Alongside number searches, Who’s Called provides practical guidance for dealing with unwanted calls and messages. Its resources explain how to block callers on Android and iPhone, register with the Telephone Preference Service, withdraw consent, and report concerns to the ICO or Action Fraud. Guides also cover phone scams, smishing, caller ID spoofing and harassment. The site publishes recent community reports and searches, offers email spam alerts, and includes information about its community guidelines and reporting methodology. Its aim is to help UK residents assess unknown calls, make more informed decisions about answering them, and find appropriate next steps when a call appears suspicious or unwanted.