Ok this is mu 2nd hero phone and both will now not allow sound to come through headphone. At 1st the sound comes through great then np sound at all through headphones. Today at lunch, I am walking outside aneto into 7-11 andfeel my phon3 vibrare and then no sound throuth the headphones. It's like the headphones are muted. When headphones are plugged in there is no symbol showing heaephones are plugged in. Any suggestions?