America’s cellular network is as vital to society as the highway system and power grids. Vulnerabilities in the mobile phone infrastructure threaten not only personal privacy and security, but also the country’s. According to intelligence reports, spies are eavesdropping on President Trump’s cellphone conversations and using fake cellular towers in Washington to intercept phone calls. Cellular communication infrastructure, the system at the heart of modern communication, commerce and governance, is woefully insecure. And we are doing nothing to fix it.