My UK iPhone (not jailbroken) has been syncing fine since I got it on Nov 9th. But, today, it's been refusing to sync. iTunes simply stays on "Syncing "iPhone"", and doesn't make any progress like it usually does. 30 minutes later, and it's still there. I've tried rebooting my Mac, my iPhone, but it's just the same. I've not changed anything recently on either device, so I can't understand why this is suddenly happening. Can anyone help, please?