Can I use a prepaid debit card and drop it?

I bought a Green Dot prepaid, reloadable Visa debit card at the store for $30 and paid the $4.50 fee to load it. I haven't activated it yet, and am weary of doing so--if I can't pay the monthly fee, what are the consequences? I plan on just using the temporary card and never touching the personalized one or depositing or anything. Could I do that? Would this affect my credit or otherwise adversely affect me?