Remember, you an only transmit/receive simultaneous voice & data if you can get viable reception and bandwidth. Verizon's argument is a lot more forceful here - who cares if you have the capability of doing simultaneous voice & data, Verizon's saying (and many, many people's experience corroborates) that ATT can't do *one* well - so then forget about both.
Sure, VZW can never do both on EVDO alone. And I guess there are *some* scenarios where voice & data concurrent use occur or are viable - esp with business travelers. But, how many of these scenarios occur where this is not also WiFi (and no, you should not be downloading a doc, talking, and driving...so really, if you're stationary, there aren't too many scenarios where this feature set is critical or optimal).
As a frequent business traveller, I've given up on talking and browsing/working on the same device.
It's clunky. If I need to enter my meeting passcode, I need to go to calendar, read the passcode, switch back to phone, enter it, go back to calendar to get the second half, go back to phone, enter it.
Gross.
I use my PHONE as my PHONE and use my iPad for docs/browsing, etc. In a pinch I'll do it all on my phone because I can, but doesn't mean I *SHOULD* or it is the best way.
Besides, voice (e.g. circuit switched) calls are going the way of the dodo bird, 100% of my conference calls are hosted on my VoIP service. Sure, POTS users can dial in to it, and they do, but when I conference off my iPad or iPhone, it's *all* going over the data connection.
VZW's data connection is reliable enough to do that most of the time, ATT has me looking for WiFi hotspots.
I use data and voice at the same time frequently.... I talk with my headphones on and can surf the web and talk on the phone at the same time