I had my blackberry replaced by an iPhone 3Gs for work. For my job, I get SMS alerts and need to respond to them in a timely manner. I would like to be able to set the phone to repeat an alert every 5 seconds or something until I unlock the phone and read it. This way it will wake me up in the middle of the night. I found a script called smsnotify.sh that will apparently kind of do this, repeating alerts ever 60 seconds. But it only works when the phone is awake. Are there any jailbreak apps available that will do this, or any way to modify the existing system to increase the rate of repeat on notifications?