Mobile voice and messaging has been around for a long time, but is still plagued with security vulnerabilities. Given the explosive growth of mobile device usage, why hasn't this problem already been solved? On this week's episode of The Secure Communications Podcast, guest Nigel Jones of KoolSpan talks about the evolving landscape of mobile communications security, and what it will take to provide a high level of security in an increasingly mobile, connected, and interoperable world.