Why would my phone do this?
So I was driving through town the other day and making a call through my Bluetooth to the place I was ordering dinner from all of the sudden I got about 15 seconds of screeching and kind of like dial up noises then I kept saying hello but no one was there so I called back and the person on the phone said to them it just sounded like a regular disconnection no weird noises. So later that night I picked up my phone and at 10pm it said I was receiving a call but my phone was on silent so I hadn't heard it ringing before I picked it up I pressed the top button to ignore the call and then my phone said I had missed the call at 945 which didn't make any sense. Although where I was when it said I was getting the call was somewhere with very little service if any at all. Then when making phone calls the last day as it's ringing the other persons phone the volume seems to shift to a few different volumes before settling for the call.
iPhone 5s, iOS 7.1.1