iPhone 5 with iOS6 seems to only have the "Repeat Alert" option under Settings/Notifications for the Messages app (iMessages and text messages). Since older flip phones always had the feature to play a sound to remind you of missed calls, unheard voicemails or unread messages, why doesn't the iPhone have this feature enabled for the Phone app? I know you can set Notifications to show either a badge or an alert on the screen along with a sound playing one time, but there is no option to repeat the alert if it was not noticed. I think this would be very helpful.