End-to-end encryption is a technology that keeps the content you share private and secure, from one endpoint (such as your phone) to another (such as the phone of the person you are talking to). The content you share will be unreadable if it is intercepted in transit.
Fi offers end-to-end encrypted calls for one-on-one conversations between Android phones on Fi by default, which means eligible phone conversations are protected automatically and only you and the person you're talking to can listen to the contents of your call.
End-to-end encrypted calls require connection to a cellular or Wi-Fi network, and is not available for calls with non-phone devices (such as a computer), group calls with 3 or more participants, forwarded calls to a number not on Fi, or calls made or received in countries where VoIP calling is not supported (Cuba, Iran, North Korea, Russia, South Sudan and Syria). Call details such as phone numbers, call duration, call time, and voicemail are not end-to-end encrypted. To learn more about end-to-end encryption on Fi, visit our Help Center.