YouMail is an Irvine, CA-based developer of a visual voicemail[1] and Robocall blocking service for mobile phones,[2] available in the US and the UK.

[4] The company also compiles the YouMail Robocall index by monitoring automated call patterns and behaviors, and verifying that activity against numbers that its customers block, or report as spam.

[9] In 2011, the company launched WhoAreYou, an app for Android that provides users with caller's names, and gives them the ability to add specific numbers to a block list, screening out robocalls and telemarketers in the process.

YouMail identifies problematic numbers through its audio fingerprinting technology and analysis of calling patterns, along with direct consumer feedback.

In turn, the Index's statistics have been regularly cited[14] by the Federal Communications Commission (FCC), consumer advocates and many other groups as the national source[15][16] for robocalling data trends.

[24] The company also produces the YouMail Robocall Index, which announced in January 2016 that Americans received over one billion unsolicited or automated calls in December 2015.

[28] Identifying these illegal calls, YouMail notified carriers, enterprises, and the authorities to locate, take down, and punish the callers, helping shut down the COVID-19 scams in just days.