Compatible with iOS 4, 5 and 6
Does that bother you when you missed a very important call. MissedReminder can help you about this.
When you missed a call, this will give you a reminder for several times. You can set the time interval. With iPhone 4, you can also flash the LED.
No new icons will be added to your homescreen. Configure MissedReminder options from your Settings.app
See the screenshots below