As most of you will also do , my phone connects to sync the moment I start the ignition. What I’ve realised is if I go thru an area that doesn’t have much of a signal (right where I live) sync will show 1 maybe 2 bars for signal strength. If I then receive or make a call , even when I’ve travelled to a better signal area, it stays as 1 bar and then interrupts my conversation. If I press a button on the phone it’ll light the screen up and then show the 5 bars that most areas get. Obviously this goes against the whole point of hands free phone calls. Anyone else had this issue? I can’t even begin to think of a way round this short of a new mast near my house. 

It’s not my phone. I had this issue with My Samsung, now same thing with an iPhone