IPhone headphone plug in messed up, how do i fix it?

I have the iPhone 4, & every time I plug in my earphones the music sounds muffled like a radio station losing signal. I don't know how this happened. I tried blowing it, in-case there's dirt but it doesn't work. It's not my earphones because I tested them on other devices and they work fine. I tried using other earphones on it though and it still sounds the same. Any ideas on what I should do?

Go on youtube and search RichsMethods he has a few vids on how to fix that

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