I stupidly clicked on a link of a trusted person's email. A website came up with a short message but nothing else. I waited maybe 20 seconds and then closed the browser. A minute later I got an email from same sender saying their email account was hacked and not to click on the link. At that point, I closed all browser windows and turned off the iphone for a minute or so. How can I find out whether my iphone (iPhone 4 with OS 5.1) is now compromised? I am hoping that their attack was aimed at Windows PCs rather than Apple devices.