In an unprecedented attack on global privacy, the UK government secretly ordered Apple to create a backdoor into its Advanced Data Protection (ADP)—the encryption tool designed to protect your most sensitive iCloud data. Instead of quietly complying, Apple publicly disabled ADP entirely for UK users. By doing this, Apple alerted the world to the secret order—but it also left UK users vulnerable. Their backups, photos, notes, and more are now accessible to the government.

Did you know you can use Signal without sharing your phone number with other users? Signal introduced usernames last year, but many people still don’t realize how they work—some mistake them for their profile name, and figuring out how to share or search for usernames can be confusing. Here’s what you need to know: how usernames work, how to set yours up, how to find others, and the privacy benefits (and limitations) of this new feature.