Share your experience!
I purchased phone Xperia J two months back.
I can clearly hear outside noise when i am hearing music with max level volume.
FM radio is not working since updated to Jelly Bean.
I expect usefull feedback on this.
Thanks in advance
I suggest that you try to run a software reinstall using SUS.
http://www.sonymobile.com/gb/tools/update-service/
If the problem still remains you should contact your local support team, to have the phone examined and fixed at an repair center.
http://www.sonymobile.com/global-en/support/contact-us/contact-info/