When I had my iPhone for about 2 days, I received an SMS message while the iPhone was in locked status (just stand-by). I pressed the button on top of the phone and the whole sms was being displayed over the whole screen, black background & white letters, without displaying the homescreen, which was actually very good readable in sunlight. I'm still wondering how I managed to got this working, because at some reason my iPhone doesn't do this anymore. I tried several settings in SMSd and iSMS but I can't figure it out..
It's not that standard blue balloon which shows a part of the sms, it was really displayed over the whole screen.. Must be an other app, but I don't know which one anymore..

Anyone ideas ?