My new iPhone 4S (week old) can't connect to iTunes, App Store or iBooks via Wi-Fi (and some other apps e.g. Hollister but most of the other apps like Safari or ebay work fine). There is no problem with those apps loading via 3G network. When I turn off the wi-fi, it runs over 3G and i can access App store without any problem. When i turn off the 3G network and turn the Wi-Fi on, those apps like App Store won't work, other apps work fine. When i turn on both Wi-Fi and 3G, the App store (and so on) is also not working, other apps are. I also found out that when the Wi-fi is on and I sign out my apple ID, the App store starts working! But when I log in again, it will imediatelly stop working. I've tried logging in with others apple IDs, still with the same result. There is no problem with my apple ID account, because it works on my iPad, even via Wi-Fi. When i first set up my iPhone, there were no complications using App store ia Wi-fi with exactly the same account. I don't know if it has anything to do with it, but this problem started when i logged in with my UK account and then wanted to log back in with my Czech account. I tried turning it off, hard reset and deleting my iPhone several time (even without back up). Nothing worked since then. Does anyone have any idea how to fix this? I would really appreciate ANY help. This is driving me crazy!