I have a bunch of SMS/Text Messages on my TREO 600 that I want stored on my SIM Archive. Is there a way to do this? I've seen apps where you can copy from the Treo to Memopad, but I need them stored on the SIM.

This is because I frequently have to change handsets and the SMS messages contain configuration messages for other handsets that I need.

So is it possible to copy SMS from the TREO memory to a SIM? Or is the lack of this a "feature"?