I would think with data going over LTE, voice over CDMA would work simultaneously. Verizon has also stated they will be doing LTE voice by 2012. That should be fantastic. At one point, they were also testing VORA, Voice over Rev. A, as a temporary measure. One problem I have is various things I've seen from AT&T and some sites saying that the Verizon iPhone can't do voice and data at the same time, but not making the distinction that is when on Verizon's network for data. I've had some users think that meant wifi as well, all data.