Simultaneous voice and data was a useful feature for me when I was with AT&T. I could receive emails from folks while I was talking to them on the phone, open an attachment, and discuss it with them.
The downside was AT&T's network, particularly data speeds. Now that I'm with Sprint I occasionally miss getting emails while on phone calls, but it's only a minor annoyance. Looks like I'll be buying yet another BB when when one comes out to support WiMax or LTE, whatever Sprint finally settles on. Current BlackBerrys won't support LTE when Verizon launches it.
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