I'm sharing a plan with my sister (i currently have a prepaid, but they will allow me to use my prepaid number) and I wont get a new phone so I decided to buy one off ebay. I heard that you need the data plan for it to work, but is it really necessary? Will it come to a point that I can't use it anymore because it doesn't have it? Examples? Also, what are some ways that I can do to prevent my data from being lost? Should I just cancel my order cause it wont be worth it without the data plan, paid $130 for the phone ..