My Iphone 4 will only let one earphone to work?

Its has just started recently and i have even tried headphones but it still only lets one side to work. I was just wondering if i need to get my phone fixed or if there's an explanation to this?

Added (1). I have tried other earphones and they work fine on other phones

Most likely its a headphone problem. Try another pair.

Hi, its only head phone problem, as don't worry your iphone is perfect in working.
But you have to purchase new earphone pair.

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