Hi I'm new to these forums so please forgive me if I don't do this right. I just bought my Samsung galaxy centrua s 738c from my local walmart on 12-31-2013 for $100 plus the $45 unlimited service plan. The phone worked great and I really do love it however... I powered my phone on after allowing it to fully charge today only to notice that the usual boot sound didn't play as it normally does. Thought to myself, "ok maybe I forgot to turn the sound back on" so I checked it only to see every volume control was infact on after& turned completely up. Tried to listen to some downloaded music...got no sound unless the headphones were used...the same thing viewing videos...my headphones had to be used. This worried me so I attempted to call Straight talk customer service only to discover I had no in call sound unless my speaker phone was on. I was instructed to do a factory reset then dial *22890 by the customer service representative. So I did and still nothing. The problem remains. I can't afford to go buy yet another phone due to living on ssi and really can't afford to send it in for repairs as I use it to contact my chronically ill and disabled sons surgeons and doctors. Can anyone tell me how to fix this issue? Can I download the firmware or software and reinstall it to accomplish fixing the issue at hand? If so...where do I find it? Any suggestions or advice is greatly appreciated. Thank you in advance my new friends!