Show a indicator for a sms in conversation item

Precondition:
1. Push and SMS are possible with a conversation partner.
2. Data and normal connection is active.
3. Receive a message.
4. Answer is made through a whisper message.

Problem:
The answer is not deliverd until the conversation partner is also online. So we both wonder why there is no ongoing message.
The received message was a sms, so I have to look into the details to know this...

Proposed solution:
Add a sms indicator to the received message.
I suggest a indicator for a received sms because it makes a special answer necessary during being online.


Discussion welcome =)