Honestly, I don't notice a big difference between the 2 in day to day tasks however, if I'm downloading a big app or watching HD videos. its not worth paying more for in my opinion but its a great bonus to have
Did you make sure Data Roaming is turned On? also make sure that your phone has service and is connected. if not call public to try to activate your phone
Hey so this deal doesn't last forever the extra data is just for 15 months i Believe. however there is a plan with 20 GB of data which is normally $55 with a promo code that brings it down to $35 and that lasts forever