If you switched from blackberry make sure the system knows you have i1. It may still think you have a bberry. I fought this for a week. Log into myboost or nextel and make sure you are profiled with an i1.
The word I got was i1 can anly do 1 thing at a time (iden network anyway) . So if sending text or email the phone won't ring. I see someone up above me disagrees. They may be right but from the problems I had it seems to be an iden bottleneck.
My evo can hotspot text and phone all at once while playing through my usb into car stereo.