Hi, Still wondering if I am the only one that can only connect to the app store or itunes over wifi and not over 3g? Im quite sure its a block of some kind, as it does work with another sim and while roaming abroad. I have tried all I could think of: Its jailbroken 2.2.1 T-Mobile UK. Removing "com.apple.mobile.installation.plist" did not solve the problem - it just comes back after a reboot. I've tried rebooting it in several ways (Bossprefs, power off/on) to no avail. Then I got tired of it and completely reinstalled the phone from scratch. After Pwning/Yellowsnowing, i did not recover the previous iphone data in Itunes, so that's a proper clean install. Without doing anything else, I tried the app store first thing and it gave the same "Cannot connect.." Safari did work so the connection was fine. Then I entered my original o2 sim to which it was previously locked, and it did work.. But still not on T-mobile UK. While roaming abroad with T-mobile UK sim it also works. Any hints are very welcome.