NEW YORK — As nearly 150 world leaders gathered in Manhattan for the U.N. General Assembly, the U.S. Secret Service quietly dismantled a massive hidden telecommunications network that investigators say could have crippled cell towers, jammed 911 calls, and overwhelmed networks.

The system was made up of more than 300 SIM servers and over 100,000 SIM cards, clustered within 35 miles of the United Nations. Investigators described it as one of the most significant communication threats ever found on U.S. soil. The network could have caused a cellular blackout in a city that depends on mobile communication for daily life, emergency response, and counterterrorism.

Officials said the discovery of the network highlights a new type of risk: threats targeting the digital infrastructure that keeps

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