I plan on using my Ipad predominately w/ wifi. I bought the 3g version for when I travel or want a more secure connection. I keep getting an annoying pop-up that says "you haven't signed up for your account"..meaning Verizon 3g acct. and you can click "now" or "later". I got tired of hitting "later" and decided to sign up and be done with it. I'll sign up for the cheapest plan ($20.00/month). My question is: If I jump thru the hoops and sign up now, will I be charged $20./month from the time of set up forward-even if I don't use 3g or can I just sign up and Verizon won't charge me until I actually use their service? Thanks in advance.