Audio output via headset jack

[PeterPa]

I can't connect anything via the headset jack so I cannot play music except though the phone's speakers

[Phy]

Could you before? Or has your jack not worked since the beginning?

[Phy]

If your issue is due to a software problem you can try repairing your phone with Sony PC Companion.
http://support.sonymobile.com/us/tools/pc-companion/

[Phy]

However, if it hasn't worked since the beginning or if the jack has gotten damaged you may have a hardware issue that needs to be repaired. If so you should contact Sony Xperia Support.
http://support.sonymobile.com/global-en/contactUs/

[Jake-SonyXperia]

Hi PeterPa,

Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

You could also try clearing the Smart Connect application to see if this app based,

Menu > Settings > Apps > All > Smart Connect > Clear Data 

let us know how you get on.

[PeterPa]

I still have not resolved this issue. Nothing I plug into the headset jack works and the audio just continues through the phone speakers.

[Phy]

@PeterPa

Contact your local Xperia Support, it seems to be hardware related.

http://support.sonymobile.com/global-en/contactUs/

[Sam]

I have noticed that no one has recommended this yet; if you have not sent it in for repair yet please simply try cleaning the headphone jack gently with something soft like a cotton tip.

[Marvin562]

I had the same problem. I called customer support and they send me the computer repair link. That did absolutely nothing but waste my time. It was definitely a hardware issue. So I took it to my phone company provider and they ordered me a replacement. I paid $5 dollars out of pocket. The whole issue was really frustrating. Especially when your suppose to have a great smart phone with the latest technology. I suggest you go to your cell phone provider and swap your Xperia for a new one. good luck and I understand your frustration.