Isn't it true you can use data and voice at the same time on a CDMA network if the network implements EV-DV? Since Sprint and Verizon (both CDMA) implement EV-DO, this restricts voice and data at the same time from occurring.
There have been a few times when I wanted to use data while on the phone. For example, if I am on a boring conference call, I could be checking Facebook, checking email, etc
