Understanding Cybersecurity of Mobile Networks ActThis bill requires the National Telecommunications and Information Administration to examine and report on the cybersecurity of mobile service networks and the vulnerability of these networks and mobile devices to cyberattacks and surveillance conducted by adversaries.The report must include, among other items, (1) an assessment of the degree to which mobile service providers have addressed certain cybersecurity vulnerabilities; (2) a discussion of the degree to which these providers have implemented cybersecurity best practices and risk assessment frameworks; and (3) an estimate of the prevalence and efficacy of encryption and authentication algorithms and techniques.