I like the Mobil Hotspot - connectivity is good. But when I'm connected via the hotspot and I receive an incoming call, it "kicks" me off of my network and I lose what I've been working on. Is there a way to send the calls to voicemail or set the phone where calls won't interrupt me while on the network? Or can you use both at the same time?
If I remember correctly, that is because the EVDO Rev.A protocol used by Verizon does not permit Voice/Data connection simultaneously. It gives priority to Voice over Data.
About your second question, it is not possible to do simultaneous voice/data with the current Verizon setup. There are some countries that have adopted a variation of the technology which allows simultaneous voice/data but VZW in US does not work that way.