I mean, obviously.
I saw that some give you a credit score/report, and thats what I'm curious about. Details please???

You can get a free credit report annually at annualcreditreport.com. It's the law.

Secured cards usually aren't that good a deal. Many have fees associated with them. You'd be better off opening a checking account and using a debit card.

If you want to build a credit history, most people can qualify for a regular, non-secured card, unless you have some really horrible marks on your report, like a recent bankruptcy. You might not get a very high credit line, but it still counts. After you make a couple on time payments, you can request to have your credit line increased (usually after 6 mos).

If you need to build your credit, it's not a bad way to start. The idea is that you will do this good, paying stuff on time. Clearly if it's prepaid you can't go over your l.imit. Then you can use that as proof of your credibility and get an unsecured card.