EvDO is Evolution for Data Only/Optimized so by definition the radio can only send/receive data or voice (on 1X) but not at the same time like with HSDPA, AT&Ts 3G technology.
Posted from my CrackBerry at wapforums.crackberry.com
I get texts while on the phone.. and I have the 8900. Data I wouldn't know because I'm rarely on the phone long enough to get bored to the extent that I need to surf the net