Hi i just got my new iphone 3g today, and the first hour it worked great. But after i got home i started changing the ringtones and text message tone. But i must of done something wrong because now the iphone wont make a noise when a get a text message, or when i type on the keyboard or press the sleep/wake button, the phone isnt on silent i tried flipping the switch several times. Can anyone please help me out?