Let me try to put it in another way. Last night I went to sleep and my 3GS was next to me, at midnight I received a text message I heard the notification but then the speaker made a beeeeeeeep sound like for 20 seconds, you really have to pay close attention to hear it but it was there. When I finally started to answer the text message I noticed that after I stopped pressing the keyboard you could hear some static coming from the internal speaker. Nothing alarming just wanted to know if you have experienced this 
