usually when u grab ur hp near to ur face when making a call, the screen will fade to black, but after u put away, the screen supposedly will reappear again. but mine didnt. even b4 jailbreaking it. the way to make it reappear again is by pressing lock button twice. i read in apple website forum many ppl encounter the same prob. they say its firmware bug. i need to know if anyone out there has the same prob as mine. or anyone has a solution to my prob. or mayb jus anybody out there knows wads actually wrong wif it. im carrying iphone 3gs. firmware 4.01

from digi....i try restore n didnt jb but still the same...i didnt send for warranty yet...coz i hope i dun hv to send for warranty if there's other options...