As excited as I am about the launch of the HTC EVO 4G, it hurt my heart a bit when I heard the news - according to HTC, the WiMAX-powered device won't support simultaneous voice and data.  The original quote from HTC, as reported by AndroidCentral, is as follows:

"If you're using 4G for data, you can't use CDMA for voice. Currently the only way to do simultaneous voice and data would be through a third-party VOIP solution. However, this is not due to strict hardware limitations, so it's possible this could change with future updates."

Note the "this is not due to strict hardware limitations" part of the quote.  In other words, the issue is on Sprint's end.  I'll admit - this is normal operating procedure for CDMA phones (unless you're using CDMA and Wi-Fi), but it shocks me that it won't be available on the nation's first WiMAX phone.  Who knows - maybe we'll see the functionality at some point in the near future?

Update: It's important to note that WiMAX data + voice is still being tested (WiMAX data and 3G voice is what's being referred to above), so it's possible that we'll be able to make simultaneous WiMAX voice and data calls.  We'll see.

Via AndroidCentral