[lorenzhs]

No, your claim is false. This has been claimed about Signal multiple times now on HN and I've never understood how people came to this conclusion, because it's just not true and never was. All your messages arrive on all your devices, even if all of them are off at the time the message is sent. It's stored in an end-to-end encrypted fashion on Signal's servers until you switch on one of them, at which point the message will be delivered. When you switch on another one, the messages will be present at that device as well. The only thing missing right now is the sync of old messages when you link a new device, but that's only relevant in the first couple of days/weeks of use.