Silent Circle of National Harbor, Maryland, offers the Silent Phone secure encrypted data communications service for Android and Apple iOS devices. The application enables secure video via smartphone over 3G, 4G, EDGE, and Wi-Fi networks. The custom-built Silent Network protects voice and video call data from interception and eavesdropping. It offers high-fidelity communications using the ZRTP peer-to-peer encryption protocol, which eliminates third-party encryption key management and tampering risks. Customers download the app from Google Play or the App Store and create an account, which features a unique phone number for secure, end-to-end encrypted calls between any two subscribers. With the Out-Circle Access option, encrypted calls can be made to regular phone lines.