NEW YORK (AP) — The U.S. Secret Service has found and is quietly dismantling a massive network of “SIM farms” across the New York area just as world leaders gather for meetings at the United Nations. 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. So what are these SIM farms and what are they capable of? SIM farms are hardware devices that can hold numerous SIM cards from different mobile operators. “The masterminds could have set this up a long time ago and be operating from thousands of miles away,” he said.