ah, ok. Yes, if you are streaming, there can be some jumpiness. I notice that some on mine with 3G, but if I let it buffer long enough, there isnt any issues. As for a full wifi connection, you should have no problem whatsoever.
Using a 3G phone as a mobile hotspot that also has to connect to something over wifi will be iffy at best for video. 4G may be a different animal.