Headphones not working anymore in my phone

I have been using my Sony heapdhones in my phone for more than a year without any problem. I was listening to the music yesterday and after a break of an hour I wanted to continue, however my headphones did not work anymore. I tried to plug the headphones in my computer and a different phone, they worked. I tried to use another pair of headphones in my phone and it worked as well (so the problem is not in the headphone jack).

Can anyone help me? It seems that my headphones and my phone do not work together anymore, but separately they do (I didn't change anything in the phone settings).

Thank you!