Ok, so I already had my phone replaced for this problem but it keeps happening. I switch auto-brightness on but it does not adjust itself accordingly. For example: I'll be in my completely dark bedroom about to go to sleep and I get my iPhone to set the alarm, but the damn thing nearly blinds me because it's so bright from me adjusting it during the day. So, I turn the brightness all the way down so I can actually see what I'm doing. The next day, I'll use my phone for something else and I can barely see anything at all because I adjusted the brightness the night before to really dim. So I turn it up all the way to avoid the sun's glare. Then the process just repeats itself and it's starting to get really annoying. Is there something I'm not getting about auto-brightness? I explained the problem to the people at the Apple store and they assured me the problem would be fixed with a new iPhone. I got a new iPhone and it still doesn't work. What are the chances? Yes, auto-brightness is on, and there is nothing blocking the light sensor. Please help. Thanks Update: I went to the Apple store and a Genius told me that he has come across this problem many times before. He said he has never once owned or seen an iPhone or iPod that has a functioning auto-brightness. Another fellow Genius also confirmed that. All he told me that hopefully Apple will come out with a patch to fix it. This doesn't really help anyone, but I hope it's an explanation for those who are also wondering.