On non-jailbroken iphones, is there an SMS notification/icon on the lock screen? (So if your phone is locked and you miss the SMS notification tone you can hit the 'home' key and see that you have a waiting SMS without having to unlock the phone.) Is it an icon of some sort or a preview of the SMS? Does anyone happen to have a screenshot of what the lock screen SMS notifications look like on a non-jailbroken iphone? TIA!