When I answer my iPhone 4s, I cannot here the person calling unless I switch to speakerphone.  How can I fix this?

When I answer my iPhone 4s I cannot hear the person calling unless I switch to speakerphone.  How do I fix this?

does it work with the headset connected if so then it's stuck in headset mode
https://discussions.apple.com/thread/1343532?start=315&tstart=0

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