April’s robocall decrease is not a surprise, however. Historically, April and May have shown flat or decreasing levels of total spam calls in the U.S. because scammers tend to push IRS & tax season phone scams in February and March ahead of the standard tax deadlines in April.  It is also notable that spam call volumes continue to grow on an annual basis and represent a record high for the month of April.

April 2021’s spam call trends may also be related to the upcoming STIR / SHAKEN (Secure Telephone Identity Revisited (STIR) and Signature-based Handling of Asserted Information Using toKENs (SHAKEN)) implementation deadline, which is designed to combat caller ID spoofing on phone networks in the United States, and recent announcements by large U.S. carriers that have already implemented the framework. However, given the continued annual growth and seasonal factors cited above, it appears unlikely that Americans can expect meaningful decreases in…

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