Welcome to LWN.net The following subscription-only content has been made available to you by an LWN subscriber. Thousands of subscribers depend on LWN for the best news from the Linux and free software communities. If you enjoy this article, please consider subscribing to LWN. Thank you for visiting LWN.net! People tend to put a lot of trust into their phones. Those devices have access to no end of sensitive data about our lives — our movements, finances, communications, and more — so phones...