"I can't hear my phone ring or vibrate unless its strapped to my ear (Galaxy S5)"
When I had my S3 I was walking down the street and I heard a phone ringing loudly. I know it wasn't my phone in my shirt pocket, it was a different ring tone. The ringing was also louder than my phone would have done. There wasn't anyone around me. It was a phone ringing in an upstairs room, across a busy street. Glad that wasn't strapped to my ear.