Not even Telegram supports multi-device sync for &#x27;locked&#x27; chats. So if you really care about security, multi-device sync is not a feature, it&#x27;s a bug anyway.<p>I know only 1 guy who uses Signal and he is an AT&amp;T systems administrator and linux addict. He understands the difference. The rest, use either iMessage or Telegram and don&#x27;t really care about the rest.