Can't make or receive calls on iphone 4

Unable to make or receive calls on my iPhone 4. I went through all the steps in support, restored my phone, updated software, etc. But no luck. When I place a call, the display shows that the call connects, but I hear nothing on the speaker, and the other end can't hear me either.
Sometimes, when I place the call, the speaker option selects itself.
Any thoughts?

It sounds as if you have tried all of the user troubleshooting. You need to make an appointment at the Genius Bar at the closest Apple store and see if there is a hardware defect.

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