When making calls while on a 4G connection with HD calling on, I get clear conversations...until I lose 4G covereage (which is often where I live and work). I understands no 4G means no VoLTE so no connection and I drop calls alot. This is incredibly frustrating as I NEVER had this problem on my Droid Razr Maxx. The other caller also frequently cant' hear me but I can hear them. When I turn off HD Calling, I no longer drop calls or having connections issues, however the call quality is terrible, I have all kinds of static and choppy connections. Any suggestions how to improve this? The whole phone aspect of my phone seems to have been overlooked on this newer phone. Hopefully this is resolved when we get upgraded to 5.1 with some kind of hand-off from VoLTE to 3G without dropping (I miss my 2 antennas in my Razr Maxx). Thanks in advanced!