Broken iPhone 4 receiver?

[xafakasix]

The receiver on my iphone 4 isnt working, they can hear me but i cant hear them, speaker phone works fine, headphones plugged in works, and the music speakers work, any ideas on why the receiver isnt working?

 

[Gadgetgeezer]

Needs new earpiece. You need to find a repairer.

 

[Himynamesnoah]

It should still be under warranty.
Just send it into Apple, usually they will replace the phone free of charge with around a 3-day turnaround.
I sent mine in, the next morning it got there and sent out a new one that night. Got it in the morning.

 

[MaxBurn]

I took mine to the apple store and had it swapped for the same problem.

 

[dtanqt]

Mine has the same issue about last year. Immediately took it to service center before it's too late.