It works on AT&T and Sprint (WP7). I can only assume you are on Verizon or T Mobile.You should have a card, if you aren't old enough, you can get pre paid VISA cards at many retail stores. They cost a little extra to activate though.At 17 if your parents are cosigned on your account, which I think they have to, open a free checking on the account with them and get a debit card issued. If you're responsible and your parents trust you, see if you can get them to co sign a credit card, if they have good credit this will help you a ton. I have a friend that did this and he had amazing credit going into college.I paid my way through college without loans and never had a credit card. It took me years of not being able to get a card or loan until getting help from friends and whatnot to build credit. Do it as early as you can. Even though I had no debt and hood income I still couldn't get credit because I didn't have history.