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Unfortunately, nothing. All data on your phone is encrypted with that code and the code is never sent anywhere, so nobody, including us, can reset it. You will need to create a new account.

Yes, at any time. Your username is only a label that lets people find you; encryption is based on your secret code. Your conversations and safety numbers stay the same, and your contacts are told your new name automatically. Your old name stays reserved for you for 14 days.

Create an account backup on the old phone, move the file to the new phone and open it with your secret code. The old phone loses access. Message history is not part of the backup.

Because notifications travel through Apple’s and Google’s servers and tell them which app sent a message to which phone, and when. In us2us, messages are fetched only while the app is open, directly from our blind relay. No company, not Apple, not Google, not us, gets a report of who received a message and when. Messages wait for you, encrypted, for up to 14 days.

Choose “Delete account” in the app’s settings. Everything on the server is deleted immediately.

Please e-mail us with “security” in the subject line, and do not publish it before we have fixed it.