The HTC Thunderbolt supports simultaneous voice and data whilst over 3G (EV/DO) thanks to something called SVDO. While this is the only CDMA handset that I know of that supports SVDO, it is 100% proof positive that it does it. I don't know why other manufacturers have elected not to use it. This is not a network-side upgrade. SVDO basically adds another radio, so one can handle 3G data (EV/DO) whilst the other handles voice (1X). This requires additional hardware and software on the part of the handset manufacturer, not the carrier. http://www.cdg.org/technology/svdo.asp The above link defines it, to some extent. http://www.youtube.com/watch?v=vJyvZgyx93Q The above link is a Youtube clip of somebody using 3G data at the same time as making a phone call. I use this feature on my Thunderbolt all the time. It works. I am not on WiFi, I am not on 4G (LTE). I ain't blind, I ain't mistaken, and I'm absolutely sick and tired of every freaking time somebody at MacRumors mentions CDMA they go on and on about how you can't do voice and data on CDMA, that it is impossible. It is absolutely possible. It may make the phone larger. It may make it more expensive. It may never be popular, but it is absolutely true that handset manufacturers can do what HTC has done and sell a CDMA phone that can make or receive phone calls during an EV/DO data session. I am posting this because I'm done correcting people in various threads. If you're going to post something you should know if what you are posting is true or false. This has become an article of faith among many, and I do not understand why I've seen multi-page threads of people basically insisting that everybody who believes a Thunderbolt can do this is an idiot. Please click on the two links above, and comment here once you have done so.