I've been frustrated with this issue with every WinMO phone on Sprint (Touch, Diamond, TP, and now TP2) I owned.
I think it's something about CDMA and how WinMo sees it... I don't think there's a way to fix it.
It's really annoying cuz if you receive a txt with your phone on your pocket, your butt will start pressing the screen and do crazy stuff with your phone... So I installed a screen locker (s2u2) to solve that problem.
But it would be nice to keep it off if there was a way to do it
