If I receive multiple text messages from the same person, they are organized in a chat thread. If I do not read any messages, the thread remains in bold indicating it is unread and each new message that comes in triggers the SMS alert. If I read any message in a thread, the thread itself is no longer bold (I assume meaning it is marked as read), but new messages that come into that thread do not make it bold again and the incoming messages do not trigger that alert. Is this normal behavior? If so, how am I to know a new message has arrived within that thread?