Steven Sande:

When you get a phone call while using data on a CDMA phone right now, that phone call goes directly to voice mail. that phone call interrupts the data connection. Likewise, you need to hang up voice calls before trying to bring up websites or capture other data. Want to use that built-in tethering app to send a 3G signal to five devices? Just don’t try to talk on the phone at the same time.