Midnight phone call issues


I have a few phones on visible plans and after update my midnight phone has issues calling and hanging up with certain other phones. If I call a phone that is an iPhone and on att network it doesn't ring while connecting, flashes an error code about calling app not working, then it won't hang up and I have to restart my phone. It happens with several different people that all have that style phone with that service provider. My old actel and also my galaxy don't have those issues. I've updated also factory reset all my midnights with no change. Also all my service has gotten worse. What's going on here visible?