I use a Galaxy Camera with a 4G LTE MiFi from Verizon, and can tell you that a Nexus with a similar backend should work nicely for you. Advantage of the MiFi is that I don't have to do anything to tether (no funny business like with a phone on US Carriers), and I am free to change the phone more often. I personally use Skype since their codecs give better quality over even 3G connections. For your consideration...