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It's own headphone is pushed up in it's position but it is not working, or working sometimes. Then when unplug it and replug then same problem is occured.
If this is a hardware issue then you either need to return it to the place of purchase or contact Xperia care http://www.sonymobile.com/global-en/support/contact-us/
I don't know if this is a hardware issue, but my friend is also facing the same problem with same handset.
