Private Messenger Without a Phone Number: Why It Matters and How It Works

In short: a phone number is one of the most personal identifiers you have, and most messengers make it your username. A messenger can work without one by giving you a cryptographic key instead. You gain privacy and control, and you take on the job of keeping that key safe.

Open almost any chat app for the first time and the first screen asks for your phone number. It feels normal because everyone does it. But that one field decides a lot about your privacy long before you send a single message. This article explains why messengers ask for it, what it reveals, and how a private messenger can work without it.

Why most messengers ask for your phone number

There are good practical reasons, and they are mostly about convenience for the service:

• Finding friends. If the app can match your contacts against its users, your friends appear automatically.
• Stopping spam. A phone number costs something to get, so it slows down people who create thousands of fake accounts.
• Account recovery. Lost your phone? Verify the number with a code and you are back in.

None of these is about protecting you. They make the app easier to grow and easier to run.

What your phone number gives away

A phone number is not like a nickname you made up. It is usually tied to your real identity, it stays the same for years, and you use it everywhere: your bank, your doctor, delivery apps and social networks.

• It links accounts together. The same number on several services makes it easy to connect them back to one person.
• It reveals who you know. Contact matching only works if the app can check the numbers in your address book.
• It is hard to change. If your number leaks with your chat account, you cannot just pick a new one the way you would change a password.
• It can be taken over. If someone convinces your carrier to move your number to their SIM card, any account that trusts that number is at risk.

End-to-end encryption protects what you say. It does nothing about the fact that your account is your phone number.

How a messenger can work without one

The alternative is to let the app create your identity on your own device. That is how amend works:

• The first time you open amend, it creates a cryptographic key pair on your phone. There is no sign-up form, no phone number and no email.
• The private key stays on your phone, encrypted at rest with the Android Keystore. It never leaves the device unless you copy your backup key yourself.
• Your public key is your amend ID. It starts with npub1 and works like a username you can share, for example as a QR code.
• Messages are end-to-end encrypted on your phone before they leave it, then passed through independent relays on the open Nostr network. There is no company server holding your messages.

Because the key is yours, nobody has to give you an account. That also means nobody can take it away or hand it over. You can read how this is handled in detail in the privacy policy.

What you give up

Going without a phone number is a trade, and it is fair to be clear about the costs:

• Recovery is your job. If you lose your key without a backup, nobody can recover your account. Not even the developer. Keep your backup key private and somewhere safe.
• Friends will not appear automatically. People need your amend ID to reach you, so you share it on purpose instead of an app scanning your contacts.
• Every new contact is a deliberate step. That is slower than a contact list that fills itself, and for many people it is exactly the point.

What a phone-free messenger still cannot hide

Removing the phone number removes one big identifier. It does not make you invisible. Any app that connects to the internet shows your IP address to the servers it talks to. In amend’s case, the relays you connect to can see your IP address, the recipient’s public key, an approximate time and the size of the encrypted data. They cannot read the message.

If your IP address matters to you, use a VPN or Tor through Orbot together with amend. We say the same on the safety page, along with another honest note: amend is a young app and has not had an independent security audit yet.

Other messengers that skip the phone number

amend is not the only option, and different apps fit different needs. Threema gives you a random ID and makes a phone number optional. Session and SimpleX do not ask for one at all. Signal has always asked for a phone number at sign-up. Since 2024 it hides your number from the people you chat with by default and lets you connect by username, and in September 2026 it started testing an optional sign-up without a phone number for Android, for a small one-time fee. If you are comparing the two, we wrote an honest comparison of amend and Signal.

A quick checklist

When you look at any messenger, ask:

1. What does it need from me to create an account?
2. Who can see my phone number or ID, and can I control that?
3. Where are my messages stored, and who runs those servers?
4. What can the servers still see, even with encryption?
5. What happens if I lose my phone?

Try it

amend is a private messenger for phones running Android 8.0 or newer. It is in closed testing on Google Play right now, and the public launch is coming soon. See the Get amend page for the current status, or look at all the features first.