Someone who is good with iphones helo me?

Hay, I have an iphone 4S and lately when I go in to the app store to purchase something that is free there's no free sign its a cloud with an arrow in it & when I click on it it takes me to the billing process but I don't have to pay because its free so i'm confused. I thought if I reset my whole phone where it deletes everything that it will work but it didn't I still have the same problem.

You still have to sign into your account and put your password in even if its free or not. Its a safety feature and you can't do anything about it.