iPhone screen blacks out

Are you using a case that may be partially blocking or blocking the iPhone's proximity sensor?

I have this same problem when I am on the phone it goes black when I take it away from my ear and I have to restart too.....any other solution besides the Iphone case issue?????

If you have a case blocking the sensor then the only way you can solve the problem is remove the case or cut a hole in the part of the case that's blocking the sensor. If you remove the case you should JUST be able to see the sensor, it's a little "i" on its side near the ear speaker.

I don't use a case and I ahve the same issue. Also, mine sometimes remains in the "accept / decline" mode of receiving a call, even if I'm actually on the call. Even more frequently (and i'm talking, like, once a day, at least), when I am done with my conversation the "End Call" button doesn't exist. Anyone else dealing with this?

I am having a similar issue. My screen blacks out randomly when i am using it sometimes. Some days it is fine but then it could happen a couple of times in one day. I hasn't occurred during or after a call yet, just during general usage. Switching to standby and back on again turns the light on again.
Just to clarify the issue, I can still see what is on the screen but it is very faint as the light behind the screen blacks out.

My phone seems to be working opposite of what it's supposed to. When I'm on the phone, the screen should become inactive and go black, and come back on when away from my head. It does the opposite and comes on while I'm talking. Then if my face or whatever touches it, strange things happen.

This is exactly what my iphone is doing. Have you had any luck fixing the problem? Thanks

I have the exact same problem. I want to follow ur advise and hopefully its just that. Will post for updates.
I've been trying to look for the "i" near the sensor. Can't find it. Can you post pics?