Samsung Galaxy W going silent when answering or making phone call

[nicnac38]

Hi everyone I wonder if anyone can help me, recently my phone calls cannot be heard when im calling someone or someone is calling me, my phone rings as normal then I answer it and there is silence on my phone and on the other persons phone, any ideas what could be wrong?

 

[queeni]

Do you have the last update ?? Version ..2.3.6