Hey there! Any luck with getting your S6 getting a solid data connection while on a call?
Happy Wednesday, ystarost!
It has been about two weeks since you posted so I wanted to swing by to see if you're still having issues with your data connection while on a call? Please keep us posted if this is still happening as we want to work with you to get this fixed.
My semi-educated guess is the device is not capable of simultaneous voice and data.
For reference, we have employer issued iPhones on Verizon. They are likewise incapable of voice and data service at the same time. Up until that time I believed this was a limitation of the CDMA technology. However, the personal Android Motorola device a colleague uses can do it. And so far as I know nothing was done as far as settings. We drilled down on both the iPhone and the Motorola trying to get to the bottom of it.
That's all I know. I don't know the technical explanations. Only our observation. My conclusion is your device can't do it. Still, it wouldn't hurt to try different network settings (make sure not on 2G) as others suggest. If that fails then feel confident the device just doesn't support that functionality.