Actually I use yahoo messenger all the time on my curve. It never logs off during or within minutes of a call. I get whatever comes in after the call ends.
Posted from my CrackBerry at wapforums.crackberry.com
and nce ur on the call long enough, like 5 to 10 minutes or more, then the app signs off as an error. Also, Ims sometimes resume on short calls but downloads through IM get canceled immediately