Ive had my 3GS for about 2 months, and now the unit is not making any external sound. It works just fine when headphones are plugged in, but not a peep without. This sounds like a software issue to me, but the The Mighty Internet claims it is hardware. I can and will get it replaced under warranty, but I cant help but wonder; am I getting a ticking time bomb? iPhone users of the world, Please give me your feedback!