07-18-2008 01:49 PM - edited 07-18-2008 01:50 PM
This is carrier and coverage/technology dependent. To be able to send/receive messages while on a voice call you must have an EVDO signal ("1XEV" indicator will be displayed). If you only have a 1x or 1X indicator you will not be able to do both activities at the same time.
07-18-2008 04:47 PM
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07-18-2008 04:52 PM
The above mention post explains how both SMS and Phone can be used in CDMA network. In GSM you can olny have this option if your are in 3G/HSDPA network.
For the original poster -- just to be clear, your 8330 is a CDMA phone, so you will be looking for the 1XEV coverage indicator.