It'll turn off any other way... I have the Samsung Vibrant with T-Mobile. The delay is set to 15 seconds and it always works. EXCEPT- The phone is one day old. Whenever I recieve a text... I get the notification in the top left-hand corner... and the display will stay up unless I press the button again. I will repeat... the phone is brand new, I have done nothing to it. Is there something I'm not doing that I should be doing?