The high-profile bust of an illegal SIM farm in New York and a spate of failures in emergency service calls in Australia have laid bare some painful vulnerabilities of public mobile networks. The US Secret Service made a huge splash last week by uncovering a SIM farm that it said was capable of jamming the New York macro network. This would be done by generating mass calls and texts and overwhelming the network. The agency dismantled a hidden cache of 300 SIM servers with over 100,000 SIM cards, located within 35 miles of the United Nations in New York. Investigators warned that this system could have been designed to disrupt the UN General Assembly, or could even have been part of…