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Hi Danud
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Try clearing the data for Smart Connect and then test the headphones with the phone after. To clear the data go into Settings > Apps > All > SmartConnect > tap Clear data.
Keep us updated, I hope this helps!
If you have tried many headphones in the handset and none of them work I would advise contacting Sony Xperia Customer Care in your region. You can find the contact details for your region by clicking the link in my signature.