It is very easy to miss the initial sound of an incoming message or a phone call especially if the smartphone was in another room at this moment, in a leather wallet or in your jacket when you're in a car or at the street. If you don't want to check the display constantly to ensure that you haven't missed an important phone call or a message you might be waiting for then you need to try Best Reminder from Smartphoneware. Best Reminder provides repeating alarms, visual notification and/or device vibrating to draw your attention to received but unnoticed messages and missed calls.

http://my-symbian.com/s60v3/software...Auto=547&faq=1