Yes, you can. That's actually what you're sort of supposed to do. However, with the Solstice not being a smartphone (as you mentioned), it probably did not have a data plan associated with it. In order to own the Infuse you must have a data plan - it's mandatory. I would call AT&T or visit in-store to add one before they automatically do. I think the standard automatic one they apply is the $25 2GB plan. You can choose between that one or the $15 200MB data plan, depending on how much data you think you will use.