I have the option to "delete old messages" at 30 and the MMS stuff set to 10. However, It deletes my incoming stuff at 30 and 10 appropriately but it doesn't delete my "sent" messages. So I'll have 30 inbox messages and then it still keeps racking up my sent stuff. Annoying! My Evo 4g didn't do this. I use Handcent and went all through the settings and couldn't find anything about it.