Can't surf the internet or use data while on a call on Sprint??

I used to be able to use data while on a call using Sprint on my Moto X 2013 but on my MXPE, the "LTE" symbol goes away as soon as I connect a call.

Is this supposed to happen or is there a setting I need to change? Is this Sprint only??

Thanks!

Talk and surf?

Does the Galaxy Note 5 (specifically Sprint) have talk and surf?