IPhone Poor Call Quality Without Headphones

I have an iPhone 4s. When I am working in my home office, the carrier signal level is good - typically three or four bars out of 5. However, the call quality is sometimes very poor - I can hear the other caller very clearly but they cannot hear me clearly and often say that it sounds like I am talking through a long tube or that my voice has some kind of metallic quality. However, when I plug my earphones in, it all works just fine. The call quality is generally fine in other locations.
I did wonder if this is something do to with the apple ambient noice cancelling system and some kind of interaction with it and the case that I am using but I have tested it with and without case and it makes no difference.
Any suggestions that you might have would be gratefully received.

I did they have know referred me to Apple!!!

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jab1820,
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Follow us on Twitter @VZWSupport

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Message was edited by: Chris Fletcher

I had the same problem a few days ago, went to the Apple Store and they told me that after using your headphones, a little switch inside the headphone jack can get stuck. They told me to plug the headphones back in and play a song and pull the headphones out while its playing (this will pause the song) push play and the speaker should work again. You may have to do this a couple of times, they had to with mine.
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IPhone Poor Call Quality Without Headphones

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