Why does my iPhone 4s' ear speaker not work after iOS 6 update?

No sooner did I update the iPhone to iOS 6, the ear piece in the device stopped working. The loud speaker works fine. I thought about possibly restoring back to 5.1.1 to see if its truly software related or if it's possibly hardware. Any help?

They actually invented new ear phones that were designed to fit in your ear and not fall out which they should work. But if you do not have enough money then I do suggest restoring it back to the 5.1.1