McCool compared the potential impact to the cellular blackouts that followed the Sept. 11 attacks and the Boston Marathon bombing, when networks collapsed under strain. This photo provided by the U.S. Secret Service, in New York, Monday, Sept. 22, 2025, shows servers on desks at the location where they were seized by the agency. (U.S. Secret Service via AP)This photo provided by the U.S. Secret Service, in New York, Monday, Sept. 22, 2025, shows SIM card packaging that was seized by the agency. (U.S. Secret Service via AP)This photo provided by the U.S. Secret Service, in New York, Monday, Sept. 22, 2025, shows part of a wall of SIM boxes that were seized by the agency. (U.S. Secret Service via AP) ExpandWhat the tech doesSIM farms are hardware devices that can hold numerous SIM cards from different mobile operators.