What Apple says about this issue is that it happens "in rare instances"
http://support.apple.com/kb/TS1559
What the heck Apple...can't you read a whole bunch of "Greyed Out" wifi problems posted in the communities and still you claim it happens in rare instances? This issue makes iPhone a dumb phone and not a smart phone anymore. If this issues is isolated, then not a hundred people should be experiencing this kind of problem. But no, I see lots of people with the same issue. And what does your Apple Care centers do, especially here in the Philippines? They say they cannot help those who beleived in Apple products and bought one. What these people can only say is that "sorry". The saddest part here is that, the problem in my iPhone 4S happened exactly a week after my warranty expired. Isn't that fun? This means iPhone hardwares only have a year of lifespan. #@$#%#@#$ after paying a huge amount of money, this is what Apple will give back to its customers. A bullcrap of aftersales experience.
I really hope Apple will look into this. After my experience, I am presonally campaigning my friends not to try Apple. Definitely Apple products are not money-worth.