Apple iPhone 5s: will we be able to simultaneously use data and voice?

I know with the iPhone 5, we were not able to use data and voice at the same time. I also know that the LTE technology allows that. With the new updated iPhone 5s, would that be possible?

Who is your carrier? My understanding is, the problem is due to the carrier, not to the phone itself.AT&T allows voice and data at the same time, but verizon (at least at one time) did not.