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Aporte original por: Cris Renteria ,


Try the following 2 suggestions,

1. with some canned air clean your dock female port on the iphone, make sure there is no lint or corrosion in there.

2. plug in your headphones into the headphone jack several times and blow some air into it as well.

I ran into this issue when i had my 3gs, the firs time i had something stuck in the headphone jack and the second my wife left it outside and port got corroded so i cleaned it with some Alcohol and small tooth brush  and it started working again.