Hi, my proximity sensor is always on. It stops when its 20-30 secs in standby.
Anyone else has this problem and know how to fix it?
Anyone else has this problem and know how to fix it?

That's not the proximity sensor, that's the front camera.
Ok, I did the same test, and I think that you are right.It's Iphone4. But when i'm in a call and go with my finger over the red light my screen goes of so i'm actually very sure it's the proximity sensor the camera is left to the speaker.
Some people started noticing the light after iOS 4.1 was released to address the proximity sensor issue the 4's were having.
I read about that but it only needs to be activated on calls not the whole time (not that my screen goes of when i'm at homescreen or something but it's glowing). That's the problem