Liked that good old function "Repeat Alerts"? This app delivers that same function but better.
Repeat Alerts Plus will remind you of a notification until you are aware of it. You can choose to get reminded of missed calls, sms, emails and any other app you want. It is also possible set the number of reminders and interval.
Repeat Alerts Plus is highly customizable so you can get it to behave exactly as you want. It also includes a setup wizard to get you started.