Since 2 days ago i've had the unopened mail message sign on the top right corner of my curve screen even though i dont have any messages. i've already tried taking out the battery and i deleted all my message but it wont go away!!
Remove the battery and the SIM card. For some reason with AT&T, sometimes you have to remove the SIM card, too...
Also, from the message screen, on the date line, press menu, and mark previous as read...