You'll also get a scannable QR code that you can present to other Threema users if you meet in person but don't want to exchange names. Otherwise, you can associate your account with an email address or phone number, which makes it easier for other Threema users to find you. When you fire up the app, it generates a unique Threema ID key, allowing you to use the app completely anonymously - no names required. Threema is a very secure end-to-end encrypted messaging app that uses the NaCl cryptography library to protect your communications.
