You can permanently disable your phone number from being recognized as a Signal user by unregistering your phone number.

Visit https://signal.org/signal/unregister/ or follow the steps for your platform:

• Android
• iOS
• Desktop

 Did you mean to view:

• Delete messages and conversation alerts
• Unlinking devices
• New Number or New Phone

Android

Follow steps to unregister:

1. In Signal, tap your profile  > Advanced > Signal messages and calls.
2. Choose OK to confirm.

iOS

Follow steps to unregister and delete your message history on this iPhone:

1. In Signal, tap your profile  > Delete Account.
2. Choose Proceed to confirm.

Desktop

Follow steps to unlink and delete your message history on Desktop.

1. Open Signal.
2. Navigate to Preferences.
   - Mac: Go to Signal > Preferences.
   - Windows: Go to File > Preferences.
   - Linux: Go to File > Preferences.
3. Select Clear Data.
4. Choose Delete All Data to confirm.
5. You will remain registered on your mobile device. Follow steps above to unregister your number. 
6. After deleting the app data, uninstall to remove Signal's app icon. 
   • Windows
     Replace <YourName> with your Windows User in the steps below
     • Select Uninstall Signal.exe in
       C:\Users\<YourName>\AppData\Local\Programs\signal-desktop
   • macOS
     • Delete the Signal.app file from the /Application or ~/Application directory
   • Linux
     • Use apt-get remove signal-desktop