I lost sound on my 3G a few times when lent from my pocket would clog up the jack. Perhaps there's something metallic in there making it think the headphones are plugged in?

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!

I tried plugging and unplugging like suggested. Still no go. thinkin more and more I got a brick.

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Nobody here'd have a 3gs Iphone they'd wanna sell do you?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed