My son's phone - a Samsung Galaxy Proclaim starting having issues the other day. When I would call him he would answer and for some reason I would be on speaker, he would shut speaker off and it would be fine.
Today his brother called him, his phone rang, he answered but neither of them could hear each other. It was like the both hit mute on their phones.
He tried calling me and I couldn't hear him, he could not hear me. He than put his headphones in phone, called me again, he COULD hear me but I could not hear him.
He called straight talk and they told him to re-set his phone to factory settings. This was done but it still will not work correctly. He can get on the internet and also send texts.