Hi, I understand how I can use multiple devices. But what can I do if I lose a device? If I don’t have the setup code. Thanks for your help.
You can share the key from one of your other devices through an backup (preferred method as it transfers messages and contacts too) or an autocrypt setup message (only transfers the key).
For an discussion on what delta chat could do to protect the data on your lost device see this thread: Provide messures for the "device lost"-case
If you lost your key you can just login and deltachat generates a new key, but you need to re-verify your contacts in this case.
A real help, thanks!