[Galaxy S III General] opica:
Firstly I'm sorry for the long text, I'll delete it if somebody will get bothered.

Let me tell you my story with mine S3.

I got mine the second day of the start of the sale, so on the 30th of May. After I got it I noticed a little defect on the side of the backplate, looked like it was dented but it wasn't, so it had to be a defect in the colour. But it really wasn't a problem or at the worst I could get a new backplate at the service.

After thirteen days I used the phone for the first time in pitch black and while I was scrolling through wallpapers I noticed ink marks on the black wallpaper. I had a line approx. 2 or 3mm thick across the whole screen in the top third of the screen and another the same thickness but only half across the screen in the lower third of the screen. I changed the phone orientation, tried a different black picture and went into recovery and the ink marks were on the same spot, so it had to be a screen defect. It started to bug me and I compared my phone in pitch black with SGS and SGS2. Older series didn't have a single defect and the black was true black, while S3 had brighter, less saturated black.

So I decided to visit the service. I described my problem pretty accurately to the guy and he wrote on the service paper that black lines were visible in the dark. I also told about backplate defect. After two days I got a call from the service, what was the problem with a backplate. They replaced it after I told them what the defect was. Then the guy on the phone said that they're waiting for new displays to arrive to change it - nothing else about the screen. So I assumed they knew about the problems.

The day after the call I decided I didn't want to have a brand new phone taken apart, so I gave a call to the service and asked if I can collect the phone. The head of the service started avoiding and started talking that they've already received new displays and my phone was already being serviced. I checked the online service site which said that the phone is still waiting for the procedure. I went there imidiatelly and the guy said that the phone was already opened and will be done in an hour (apparently some calibration needed to be done also). The screen was replaced. After an hour I got the phone I took it home and checked it in pitch black. I could see two ink spots which was tolerable but then I noticed another problem. The margin on the left side was okay, on the right side there was a milimeter wider gap (not at the display but at the side of the front panel). I took the phone back and described a problem and firstly the guy said that the body is all-plastic and I can't get one with perfect gaps (?!? I mean WTF). So he pulled out his S3 and compared the two and he brought a new display (which is a complete frontside panel of the phone) and asked if that one was okay, I checked it and it was. He changed it in 15 minutes. I brought the phone home again and checked it in pitch black and it was full of black spots (at least 10 dots). Then I took the phone back to the shop I got it and described my problems, they took it and sent it to the service again (I also sent a mail with link to this thread and that picture that could be found in this thred with ink marks visible). After a week the service said that the phone is working properly and nothing is wrong with it. Now I'm waiting if I could get a brand new device.

Firstly I thought that the screen isn't calibrated properly as I compared the S3 unit with S and S2, the blacks on older units were darker, so I thought that only calibration needed to be done. Today I even got a mail from my mobile service provider that they've asked the service about the display problems, and the answer they've provided:

'Some customers complain of residual pre-images in the new screen. This is the normal operation of the phone, it is by setting the display resolution to a lower contrast than maximum, picture in picture no longer exists, so this is no reason for complaint or enforcement of a clerical error.' (this is translated by google:)

What do you think? It's bothering me that the unit is pretty expensive (600+ €) and the old Galaxy S I had cost me almost half less (new) and had no problems for two years with it.